I got the answer b hope it helps
Answer:
31/100 and 215/1,000 and 6704/10,000
the pattern is you are adding another 0 to the denominator
There are infinitely prime numbers "p", but p+2 and p+4 are not primes.
Example: Suppose p = 7 (prime) if you add 2, it becomes 9 (Not a Prime).
Same thing if p = 11(prime), if yo add 4, it becomes 15 (Not a prime number)