The product of the smallest prime number and the smallest composite number is. 

Concept -

Prime Number:
A prime number is a natural number greater than 1 that has exactly two distinct positive divisors: 1 and the number itself.

For example, 2, 3, 5, 7, 11, and 13 are prime numbers because their only factors are 1 and the number itself.

Composite Number:
A composite number is a natural number greater than 1 that has more than two distinct positive divisors.

For instance, 4, 6, 8, 9, and 10 are composite numbers because they have divisors other than 1 and the number itself. 

Explanation -

The smallest prime number is 2, and

the smallest composite number is 4.

So, the product of the smallest prime number (2) and the smallest composite number (4) =  2 x 4 = 8.

Hence the option (3) is correct.