Assertion (A): Parties shape public opinion.
Reason (R): They raise and highlight issues of importance.
(a) Both (A) and (R) are true and (R) explains (A)
(b) Both (A) and (R) are true and (R) does not explain (A).
(c) (A) is correct and (R) is false
(d) (A) is false and (R) is true