Choose the most appropriate option to change the narration (direct / indirect) of the given sentence.

Dheerendra said to me, “I dropped the thought of switching roles with my friend.”

a) Dheerendra told me that he had dropped the thought of switching roles with my friend.
b) Dheerendra said that he drops the thought of switching roles with my friend.
c) Dheerendra told to me that I have dropped the thought of switching roles with my friend.
d) Dheerendra said to me that he had dropped the thought of switching roles with my friend.