Question

There always exists a/an ________ between any two integers.

• A. natural number
• B. whole number
• C. integer
• D. rational number

Answer 1

The correct option is D rational number

If we take any two consecutive integers then there won't be any integer or whole number or natural number between these two consecutive integers.
However, there will always exist a rational number between any two integers.
A rational number $\frac{a+b}{2}$ will always lie between two rational numbers, a and b.