Concept:Any non-zero number to the power 0 is 1. Write both sides as powers of the same base (2); if 2x=2n then x=n.Solution:20=1, so the right side is 8×1=8.The equation becomes 2x=8.Write 8 as a power of 2: 8=2×2×2=23So 2x=23; the bases are equal, so the indices are equal.x=3Key point:20 is 1, not 0; treating it as 0 would make the right side 0, which no power of 2 equals.Answer:Option A (x=3)