What motivates the speaker in sonnet 18 ("shall i compare thee to a summer's day? ") to write the sonnet?
a.
he hopes to gain his beloved's love by flattering her with false praise.
b.
he wants to record his beloved's beauty for all time.
c.
he hopes to convince his beloved to stop worrying about how she looks.
d.
he wants to tease his beloved by showing how she is like a hot, windy day.

The best and most correct answer among the choices provided by your question is the third choice or letter C.

His beloved's worry about how she looks motivates the speaker in Sonnet 18 ("Shall I compare thee to a summer's day?") to write the sonnet.

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