Michelle is thinking of a rational number that is an integer.
Integers are the whole numbers that are positive or negative
Integers does not include fractions
is a fraction so it is not an integer
, we cannot simplify square root (15) so this is not an integer.
0.2 is a decimal so 0.2 is not an integer

Square root (100)= 10
square root (25) = 5
So
becomes
= 2
2 is an integer
So option A is correct