Step 1: Assertion (A): more than five combined techniques give relatively higher adoption than a single technique, a moderate, well-supported claim, true.
Step 2: Reason (R): claims a single technique is usually useless, an absolute overstatement.
Step 3: A single well-executed technique can still be effective, just less so, so (R) is not accurate.
Step 4: (A) true, (R) false, so the correct option is (2).