The correct option is
B Isn't it
The correct answer is Option B.In the given question we are to choose the correct question tag that completes the sentence.
A question tag is a grammatical structure in which a declarative statement or an imperative is turned into the interrogative. For e.g., in the sentence "You are John, aren't you?", the statement "You're John" is turned into a question tag "aren't you".
There are certain rules to be followed while forming question tags.
A positive statement is followed by a negative question tag and vice versa.
In the given sentence the statement is 'pleasing is'.
Thus while forming the question tag, 'pleasing' will be replaced by a third person pronoun- 'it' and 'is' - the positive will change to the negative -'isn't'.
Therefore the correct answer is Option B- 'isn't it'.
Option A- IS IT is the correct question tag if the statement is in the negative. If the statement would have been 'is not', then 'is it' would be the correct answer.
Option C-HASN'T IT is the question tag if the statement is 'has it'.
Option D- WON'T IT is the question tag if the statement is 'will it'.
Hence these 3 options are incorrect and option B is the correct answer.