The correct answer is D. 1243.
The word “was” is the past tense of the verb “to be.” It is used to indicate that an action or event happened in the past. In this case, the action is the appointment of the supervisor.
The word “appointed” is the past participle of the verb “to appoint.” It is used to form the passive voice of the verb. In this case, the passive voice is used to indicate that the supervisor was appointed by someone else.
The word “he” is a pronoun that refers to a male person. In this case, the pronoun refers to the supervisor.
The word “supervisor” is a noun that refers to a person who is in charge of a group of people. In this case, the supervisor is in charge of the group of people who are working on the project.
The other options are incorrect because they do not follow the correct order of the words. Option A, 1234, is incorrect because the word “was” comes after the word “he.” Option B, 4321, is incorrect because the word “appointed” comes after the word “he.” Option C, 3124, is incorrect because the word “supervisor” comes after the word “he.”