This type of number can be written as a fraction p/q, where p and q are integers and q is not equal to zero.

a. an irrational number.
b. a rational number.
c. all numbers can be written in this way

The correct answer is option B i.e. rational numbers. Any number written in the type of number can be written as a fraction p/q, where p and q are integers and q is not equal to zero, is called as rational numbers. Example - 4/5, 2, 100, 1/7 etc all are rational numbers.