In the following question, the given sentence has four parts marked A, B, C, and D. Choose the part of the sentence with the error and mark as your answer. If there is no error, mark 'No error (D)' as your answer.
Tickle is (A)/ one of the broadest and deepest (B)/ subject in science. (C)/ No error (D)

Correct option is C

Option (c) contains an error.
Error Identification: The noun "subject" should be plural because "one of the broadest and deepest" implies that there are multiple subjects being referred to.
Grammatical Explanation: The phrase "one of the" is always followed by a plural noun because it refers to one item out of a larger group.
Corrected sentence: "Tickle is one of the broadest and deepest subjects in science."
Explanation: "Subjects" is the correct plural form to agree with "one of the."