If you need another hint then scroll down further.
The words don't really mean anything.
The first question could just as well have been written as:
1) R c
(a) I and C
(b) C and T
(c) A and C
(d) C
where R, I, C and T are entities that do things and 'c' is a verb.
If (a) is true, what does that say about (d)?