Answer:
Option C
Explanation:
The given numbers are in binary system by converting these into the decimal system we get
$1011= 1\times 2^{3} +0\times 2^{2}+1\times 2^{1}+1\times 2^{0}$
$1101=8+4+1=13$
$1111=8+4+2+1=15$
$10001=16+0+0+0+1=17$
All the given numbers except 15 are prime numbers
