I believe A is the best option
i would say the answer is
C. intelligent
Answer:
Have you <u>been</u> to Singapore?
Explanation:
Have you be to Singapore, have you being to Singapore, have you went to Singapore are all the wrong tenses.
Have you been to Singapore is in the right time tense.
I think it should be D) Olympic athletes and their <span>achievements </span>
It is know as the age of prose