Which of the following terms have only one variable?

For the first term, a and b are variables. Therefore, this term has 2 variables

For the third term, z and p are variables. Therefore, this term has 2 variables

For the second term, x is a variable. Therefore, this term has 1 variable

For the fourth term, t is a variable. Therefore, this term has 1 variable.

For the fifth term, p and q are variables. Therefore, this term has 2 variables

The third and fourth terms (III and IV) have only 1 variable each. Clearly, the answer is B.

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