Which statement is true?

a. two angles can be complementary and equal.

b. two angles cannot be equal if they are complementary.

c. an angle can be complementary only is it is 90°.

d. only three angles can be supplementary.

C.

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In order to determine whether two expressions are equivalent to one another, they are equated using an equals to sign (=) and then simplified. Upon simplification, the expressions should yield a logical and true statement. For example, a simplified expression may present
2 = 2
If such a case is present, then we know that the expressions are indeed equal. However, if the two sides are not equal, lets say
2 = 3
Then the expressions are not equal.

By verifying expressions, we are usually able to cross check our solutions to problems and also determine whether the answer(s) obtained makes sense.