AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) A is false and R is true.
Assertion (A) is false because State parties are not always regional in ideology — some have national-level organisations. Reason (R) is true and correctly contradicts (A).
The textbook clearly states: "these parties need not be regional in their ideology or outlook. Some are all-India parties that happen to have succeeded only in some states." Examples like Samajwadi Party and RJD have national-level units. So A is wrong; R correctly explains why A is wrong, making option (C) the right choice.