The correct answer is f, g, and h only.
What is variable ?
Given,
expression f + 2g + h/4 - 7
So, in this expression g, f and h are variables.
We can see that in our given expression g, f and h are unknown, therefore, these are variables for our given expression.
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The correct question is -
What are the variables in this expression?
f + 2g + h/4 - 7
A) f and g only
B) g and h only
C) f, g, and -7 only
D) f, g, and h only