Correct option is A
Given Series:
+ 25 @ 36 # 29 37 % 14 - 7
Prime numbers in the given series: 29, 37, and 7.
Logic: Prime number | Symbol or Symbol | Prime number

Now, see the symbols that has a prime number on either side
So, 3 symbols- #, % and – have prime number on either side.
Thus, correct option is (a).