Final answer:
The subject of this question is English. The grade level is High School. The correct answer is to change "coordination" to "coordinating".
Step-by-step explanation:
The correct answer to this question is (C) change "coordination" to "coordinating". The original sentence reads, "Once a request to carry firearms into a foreign country are approved, a Transportation Security Inspector must notify the Office of Foreign Operations for coordination of the request." Here, the subject of the sentence is 'a request to carry firearms into a foreign country', which is singular. Therefore, the verb 'are' should be changed to 'is'. Additionally, the correct gerund form should be used, which is 'coordinating' rather than 'coordination'.