The product of two rational numbers can always be written as
a. an irrational number
b. a whole number
c. an integer
d. a fraction

Option d - A fraction

Step-by-step explanation:

To find : The product of two rational numbers can always be written as ?

Solution :  

A rational number is defined as a number written in the form of where, p and q are integers and q is non-zero.

So, A rational number can be expressed as a fraction with integer values in the numerator and denominator.

Multiplying two rational number is the same as multiplying two such fractions, which will result in another fraction of this same form.

For example -

Let two rational numbers and are two rational numbers.

Product of two rational numbers is

Therefore, The product of two rational numbers can always be written as a fraction.

So, Option d is correct.