Fill in the blank with the most appropriate option:
A: I bought this pen today and it doesn’t work.
B: ___________________________________.
A) Could you fill it with ink?
B) Shall I give you another one?
C) You should take it back
D) It cannot be expensive

Hint: Conversation between two people A and B, so here we have to find the most appropriate answer that fits in the blank logically. So, the best part is that I read it carefully and try to figure out the best option given in the question.

Complete answer:
Option A) Could you fill it with ink? – is an incorrect answer because here the person A is talking about the defective pen. So, it might happen that if the pen is filled with ink it will still not work. So, this is an incorrect answer.
Option B) Shall I give you another one? – is an incorrect answer because ‘shall I give you another one’ does not fit here correctly and does not fit here in the blank. Thus, this is an incorrect answer.
Option C) You should take it back – is the correct answer because here person B is giving advice that A should return back the pen to the shopkeeper. So, here it fits logically and grammatically correct. Thus, this is the correct answer.
Option D) It cannot be expensive – is an incorrect answer because it has nothing to do with the expensive or inexpensive. Simply given that pen is not working so the use of ‘it cannot be expensive’ does not fit here in the blank. Thus, this is an incorrect answer.

Hence, the correct answer is option ‘C’.

Note: In this question the sentence talks about a defective product i.e. the pen, the advice should be to return it. Hence, Option C is the most appropriate answer and the rest of the options do not fit this accurately, hence, other options are incorrect.