I think that the answer is A discuss the material with others
Find the verb first.
-told
ask who or what to find the subject.
told who or what?
Mr.Archer
ask who or what to find direct object.
Mr.Archer told who or what?
history
ask to who or to what to find indirect object.
Mr.Archer told history to who or to what?
us.
so, "us" is an indirect object.
All of them. The word is not capitalized at the beginning of all the sentences.