Answer :
"we will talk about it" is the main clause among the following choices given in the sentence. The correct option among all the options that are given in the question is the second option.
"Noun" is the type of subordinate clause among the following choices given in the question. The correct option among all the options that are given in the question is the first option.
"Noun" is the type of subordinate clause among the following choices given in the question. The correct option among all the options that are given in the question is the first option.