Correct Answer: C

Rationale: A statement of fact can be proved or checked. A statement of opinion is what someone thinks or believes. In this case, statements A, B, and D could be proved scientifically, but statement C is simply a suggestion. While it is advisable for older people to monitor their blood pressure due to the increased risk associated with aging, the statement itself is an opinion because it suggests what older people 'must' do, which is a subjective viewpoint rather than a verifiable fact. Statements A, B, and D provide factual information supported by scientific evidence, making them statements of fact rather than opinion.

Correct Answer: A

Rationale: The main idea is that super foods are low in calories but provide essential nutrients with significant health benefits.

Correct Answer: D

Rationale: The passage does not suggest that super foods are more expensive than processed foods.

Correct Answer: A

Rationale: The passage discusses the long-term effects of environmental toxins, which aligns with this main idea.

Correct Answer: A

Rationale: The passage discusses the positive effects of sunlight, including vitamin D synthesis.