Option C: (A) is true, but (R) is false.
Assertion is correct — every party must register with the Election Commission. However, the Reason is false — unique election symbols are given only to recognised parties, not to all political parties.
The passage clearly states: "Every party in the country has to register with the Election Commission" (A is true). It also states that a unique symbol is given only to large, established, recognised parties — not to all parties. So R is false, making option C correct. Students often confuse registration (mandatory for all) with recognition (earned by fulfilling specific criteria).