The correct option is A B
Let’s examine the sentence: “Candidates work hard because they may get through.” The sentence expresses the cause, i.e., “Candidates work hard,” and effect, i.e., “they may get through.” However, it uses the wrong conjunction, i.e., “because,” to join the cause to its effect. When we use “because,” we put effect before it and cause after it. In the sentence, the cause is coming before the conjunction and effect is coming after it. Hence, the right conjunction to use here would be “so that.” So, the correct sentence would be, “Candidates work hard so that they may get through.” Hence, the error is in Part B of the sentence. So, Option B is the correct answer.