So basically whats figurative language : Figurative language is the use of words in an unusual or imaginative manner. Often figurative language involves the use of a metaphor, a simile, personification, hyperbole, idiom, a euphemism, and pun.
I would definitely go with C. a topic sentence. While A. is never a bad idea, essay paragraphs tend to get marked as off topic if there is not a topic sentence. Hope this is helpful!
Answer:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.