Why might a writer choose to use modal verbs?

Writers often choose to use modal verbs because they effectively convey nuances in meaning related to ability, probability, permission, and advisability. For instance, using modal verbs like "can" indicates ability, while "might" or "could" suggest possibility, and "should" indicates a recommendation or advice. This flexibility allows writers to express conditions and attitudes towards actions, making their language more precise and impactful. By using modal verbs, a writer can convey not just the action itself, but also the speaker's viewpoint on that action, whether it is obligatory, possible, or desirable. This enhances the clarity and depth of the message being communicated, which is why option B is the most fitting choice.