Certain parts of the following sentences have been underlined and marked.…

Step 1: Analyze the sentence for grammatical correctness. The sentence is: 'This is not the first time I am hearing of your insubordination.' Step 2: Examine option (1) 'This is not'. This is a correct present simple construction used to make a general statement. No error is present. Step 3: Examine option (2) 'the first time'. This is a standard phrase used to indicate a first occurrence. It is grammatically correct and commonly used. Step 4: Examine option (3) 'I am hearing'. The verb 'hear' is a stative verb, which describes a state rather than an action. Stative verbs are not typically used in continuous tenses. The correct form should be 'I hear' or 'I have heard'. Step 5: Examine option (4) 'of your insubordination'. This is a prepositional phrase that correctly follows the verb 'hearing'. The preposition 'of' is appropriate here. Conclusion: The error lies in the use of 'I am hearing' because 'hear' is a stative verb and should not be used in the continuous tense.