Correct Answer: C

Rationale: The passage does not claim that super foods help in building muscle mass.

Correct Answer: A

Rationale: The author's attitude toward yoga seems to be positive and sincere. Earnest (choice A) would be a good description of this tone.

Correct Answer: C

Rationale: Tolerance in this context refers to endurance, particularly in relation to pain.

Correct Answer: B

Rationale: The tone is uncertain because the author raises questions about the efficacy of aromatherapy.

Correct Answer: D

Rationale: The title 'The Debate over Barefoot Running' captures the main discussion in the passage.