Final answer:
The correct sentence is 'b. Mark studies every night for his Chemistry class.' It is grammatically correct, while the others have capitalization and structural issues.
Step-by-step explanation:
The correct sentence from the options provided is b. Mark studies every night for his Chemistry class. This sentence is grammatically correct, with a clear subject (Mark) and a predicate that describes what he does (studies every night for his Chemistry class). In contrast, the other sentences contain various grammatical issues:
- a. has no incorrect content, but could be improved by specifying 'Botany 101 class'.
- c. should have 'Composition' capitalized as it is a specific course title.
- d. should have 'French' capitalized because it is a language.
In English composition, it's crucial to have proper sentence structure and to follow standard capitalization and punctuation rules.