Which of the following is an rational number? *?

I guess the number must be imaginary.

llaffer deserves Thumbs Up and Favorite Answer on this one!
????????????????????

It looks like a multiple-choice question, but options are missed.

None - unless you edit your Q for some meaning  !

In English:  A rational number 
<I'm wondering who is asking all these simpleton questions using very basic grammatical mistakes?> 

"In mathematics, a rational number is a number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.[1] Since q may be equal to 1, every integer is a rational number." 

Quoted from Wikipedia: 
https://en.wikipedia.org/wiki/Rational_number 

To sum up, rational numbers are numbers that can be expressed as the quotient of two integers. Rational numbers form an important class of numbers and are the simplest set of numbers that is closed under the 4 cardinal arithmetic operations of addition, subtraction, multiplication, and division.

'A rational' and it isn't 'an rational'.

A rational number is a number that can be in the form p/q 
where p and q are integers and q is not equal to zero.

No, * is not a rational number.              .

A rational number can be written as the ratio of integers.
Any whole number, fraction, terminating or repeating decimal is rational. Most roots and transcendental numbers are not rational.

A rational number is a number that can be expressed as the quotient of two integers.

You forget something?

E and pi are irrational because they dont repeat themselves and dont end. Divide 22 by 7 hint 70 is only number 7 can Divide into 0 without a reminder but in division 9 is the highest you can go