1. Among the 100 natural numbers from $1 \sim 100$, the percentage of prime numbers is ( ).
(A) $25 \%$
(B) $24 \%$
(C) $23 \%$
(D) $22 \%$
- 1.A.

Among the 100 natural numbers from 1 to 100, there are prime numbers $2,3,5,7$, $11,13,17,19,23,29,31,37,41,43,47,53,59,61,67$, $71,73,79,83,89,97$ totaling 25, so the percentage of prime numbers among them is $25 \%$.