Given below are four sentences, out of which one sentence is grammatically correct. Choose the option which points out the grammatically correct sentence. If all sentences are incorrect. Choose ‘All sentences are incorrect’ as your answer.

Correct option is D

Below is an evaluation of the correctness of all the sentence in the options.
(a) The error in statement (a) lies in the usage of the connector "Since" to introduce a contrast or contradiction. "Since" is typically used to indicate a reason or cause, not to express opposition or contradiction. To correct the error, we need to replace "Since" with a connector that conveys a contrast. One appropriate connector for this purpose is "Even though." "Even though" is a concessive conjunction that introduces a subordinate clause indicating opposition or contradiction to the main clause. The use of "Even though" appropriately introduces the contrast between the enjoyment of the current career and the consideration of a different career path. It conveys the idea that despite the enjoyment, there is a contradiction or opposition in the decision to become a fireman instead. The sentence could thus be rewritten as "Even though he enjoys his career as a police officer, he is thinking about becoming a fireman instead."
(b) The error in the sentence is the placement of the subject "she." In a sentence using "not only... but also," you should include the auxiliary verb (typically "did" in past tense) before the subject. Here's the corrected sentence:
"Not only did she excel in academics, but she also shone in extracurricular activities."
In this corrected version, "did" is included before the subject "she," making the sentence grammatically correct.
(c) The error in this sentence is a verb tense inconsistency. The verb "went" is in the past tense, but the context suggests that the action is still ongoing. To correct this error, the sentence could be rewritten as: "Without a doubt, my parents are going to reprimand me for not passing any of my classes this semester."