If a is a rational number and b is a rational number, then the product ab must be

A) rational.

B) imaginary.

C) an integer.

D) irrational.

A. Rational

Step-by-step explanation:

You cant make imaginary numbers by multiplication of rational numbers.

Since rational numbers includes fractions, a multiplication of rational numbers wont always mean a integer.

You cant make an irrational number by multiplication of rational.

Our answer must be rational.