Choose the indirect speech of the sentence: He said to me 'Thank you'

Choose the indirect speech of the sentence:
He said to me 'Thank you'

A He thanks you

B He thanked you

C He thanked me

D He thanks me

Correct Answer: Option C

sub + thanked/ congratulated / welcomed + obj. বসে। অর্থাৎ He said to me, "Thank you" এর indirect form হচ্ছে - He thanked me.