The number which is neither prime nor composite is
(a) 0
(b) 1
(c) 2
(d) 3

The correct option is (b).
1 is neither prime nor composite.

Option (a) is not correct because composite numbers are defined for positive numbers, but 0 is neither a positive number nor a negative number.
Option (c) ​is not correct because 2 is a prime number.
Option (d) is not correct because 3 is a prime number.​