The correct option is B 36a,57b,18a2b
Unlike Terms:––––––––––––––––––
Unlike terms are two or more terms that are not like, i.e. they do not have the same variables or powers.
Note:–––––––
∙ The order of the variables does not matter unless there is a power.
Let's take a look at each option separately.
In option (a.), there are two like terms as 9p and 27p. These two like terms are unlike to 18q.
In option (b.), there are three unlike terms as 36a,57b and 18a2b.
In option (c.), there are two like terms as 23x and 39x. These two like terms are unlike to 46xy.
In option (d.), there are two like terms as 18n and 25n. These two like terms are unlike to 13m.
But we need to find the option which contains all unlike terms in it.
Therefore, option (b.) is the correct answer.