The doctor advised him to go . . . . . . . . several medical tests.

The correct answer is C. The doctor advised him to go through several medical tests.

The other options are incorrect because:

• A. “under” is not a preposition that is typically used with the verb “advise”.
• B. “about” is a preposition that can be used with the verb “advise”, but it would not make sense in this context. The doctor is not advising the patient to think about getting medical tests.
• D. “into” is a preposition that can be used with the verb “advise”, but it would not make sense in
  Join Our Telegram Channel
  75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube