Which of the following is a pair of like terms?
Explanation for correct answers:
Determine the pair of like terms:
Like terms are the terms that exactly have the same variables with equal powers.
The terms have the same variables with the same powers.
So, are like terms.
Thus, option B is correct.
Explanation for all incorrect answers:
The exponent of in the term is but in .
So, are not like terms.
Thus, option A is incorrect.
The exponent of in the term is but in .
So, are not like terms.
Thus, option C is incorrect.
The exponent of in the term is but in .
So, are not like terms.
Thus, option D is incorrect.
Hence, the correct option is 'B'.