A. Was
B. Has been
C. Is
D. Had been
🧠 Explanation:
The correct form is “has been”, using the present perfect tense to indicate a condition starting in the past and continuing until now. “Has” is an auxiliary verb, and “been” is the past participle of “be.” Alternatives could include “is” informally, but “has been” is grammatically accurate. Hence, the correct answer is Has been.
