Explain how images and captions can you understand the main idea.

Images create a visual representation of the text, while the caption is the text that accompanies an image, giving it meaning or clarification.

Explanation:

Much more than merely embellishing or elucidating the text, illustration can thus represent, describe, narrate, symbolize, express, play, persuade, normalize, punctuate, in addition to emphasizing its own configuration, draw attention to its support or to the visual language. It is important to note that the image rarely performs a single function, but, as with verbal language, functions are organized hierarchically in relation to a dominant function.

On the other hand, subtitles are the texts that appear immediately below or alongside (or, more rarely, above) an image, identifying it, contextualizing it and adding some information from the text that accompanies it.

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the answer is definitely option c. "sonnet xxxi best illustrates the division. in the octave, the poet observes that the moon is in love. in the sestet, he gives his reaction to the fickleness of woman's love."