Correct Answer: D

Rationale: The correct answer is D. This choice effectively combines the two sentences with the use of a comma before 'and' to connect the two related but independent clauses. The comma helps to separate the contrasting information about German cuisine and the Sunday dinner, maintaining a clear and coherent structure. Choices A, B, and C are incorrect because they either lack the necessary punctuation or use 'but' instead of 'and,' which disrupts the flow of the combined sentence and fails to convey the intended relationship between the two ideas.

Correct Answer: C

Rationale: Option C is the best revision as it provides clarity and context to the sentence. It conveys the idea that the individuals rejoiced after successfully finding a creative solution to a persistent technological issue. Choice A is incorrect as it leaves the sentence unchanged without adding any context. Choice B introduces the phrase 'nagging technology problem,' which alters the original meaning and is not as concise as the correct answer. Choice D alters the sentence structure and does not effectively convey the intended meaning of rejoicing after finding a solution.

Correct Answer: C

Rationale: The correct answer is C because when referencing a specific report, publication, or statistic like 'gas prices are up 11% from last month,' a citation is necessary to provide credibility and allow readers to verify the information. Choice A is a general statement about gasoline prices and does not require a citation as it is commonly known information. Choice B is a personal observation and not a direct reference to a specific source that would require a citation. Choice D is an anecdotal experience and does not present verifiable data that necessitates a citation.

Correct Answer: B

Rationale: Option B is the correct answer as it uses formal language, appropriate structure, and organized transitions like 'Ideally,' 'Secondly,' and 'Then,' which are essential for a formal speech. The tone is professional and clear, with well-constructed sentences that effectively convey the necessary information. Options A, C, and D either use informal language, lack the organized flow needed in a formal setting, or have less professional tone. Therefore, Option B stands out as the best fit for a formal speech.

Correct Answer: A

Rationale: Choice A demonstrates correct punctuation. The sentence uses a colon to introduce a list, which is the most appropriate punctuation in this context. A colon is typically used to signal that a list or explanation follows, making it the suitable choice here. Choices B, C, and D either use a comma, semi-colon, or dash incorrectly to introduce the list, deviating from the standard punctuation rule for listing items. Therefore, they are incorrect in the context of this sentence.