Identify the tense used in the following sentence:I have been working on the problem.

Answer: Option B

In this sentence, the structure "have been working" indicates the present perfect continuous tense. This tense is formed using the present tense of the auxiliary verb "have" (I have) followed by the present participle (-ing form) of the main verb "work." The present perfect continuous tense is used to express actions that started in the past, are still ongoing in the present, and may continue into the future.