Question

the general was much surprised to find himself known by such creatures change into active voice​

Answer 1

am surprised by you.

Option C is correct as the subject of the given sentence (you) comes in the place of the object (me) and vice versa, the same tense is used (simple present tense), and the helping verb 'am' is used with the past participle of the main verb (surprise).

Options A, B,and D are wrong as the object is not mentioned, the subject is not in its place, and 'he' cannot be used respectively

hope it's help you