I think the answer is B. The reason for this is in the reading he mentions, " But to himself so secret and so close, So far from sounding and discovery, As is the bud bit with an envious worm, Ere he can spread his sweet leaves to the air, Or dedicate his beauty to the sun."
Therefore. the answer should be He thinks his son will destroy himself by being overly emotional about love.
If it's not useful, feel free to report for mistake in answer. -_-