Select the most appropriate option that can substitute the highlighted words.
I am trying to study, if it is impossible with all this noise.

Correct option is B

The correct substitution of the highlighted words is (b) but it is impossible.
Explanation: The sentence expresses a contrast between effort and difficulty. “But” is the correct coordinating conjunction to show opposition or contrast.
Correct sentence: I am trying to study, but it is impossible with all this noise.
Grammatical Rule Used: Use of conjunction “but” to contrast two opposite ideas.
Example: He wanted to help, but he didn’t know how.
Other options are incorrect as:
· (a) “that it is impossible” is grammatically incorrect.
· (c) “while” implies simultaneity, not contrast.
· (d) “unless” is used for conditional negatives and doesn't fit here.