Fill in blank no. (4) with a suitable option:
The correct answer is option C.
Option C is the correct answer as 'to care’ indicates correctly the reason why Suu Kyi returned.
Options A, B and D are incorrect because they do not correctly indicate the reason of Suu Kyi's return.
Option A : caring is an adjective used to describe a person.
Option B : Cared is in the past tense and cannot be used to indicate the reason of return.
Option D : cares can be used a verb in the present tense and not to indicate reason.
Hence the above options are incorrect and option C is the correct answer.