The following calculations is equal to 1 is A:

The true statement is A:
is equal to 1. This is a straightforward arithmetic calculation where the numerator and denominator are the same, resulting in a quotient of 1.
False Statement B:
is not equal to 1. This fraction represents three-quarters, which is less than 1.
False Statement C:
is not equal to 1. The square root of 9 is 3, not 1.
False Statement D:
is not equal to 1. The subtraction of 1 from 2 results in 1, not equality to 1.
The probable question may be:
which of the following calculations is equal to 1?
A.
is equal to 1.
B.
is equal to 1.
C.
is equal to 1.
D.
is equal to 1.