問PP1-DS-84

if p is a prime number greater than 2, what is the value of p?

(1) there are a total of 100 prime numbers between 1 and p+1

(2) there are a total of p prime numbers between 1 and 3912

the answer is (D)

I understand why (1) can let this argument right

but I cannot figure out why (2) can be sufficient..........