at
of
on
over
Answer is Right!
Answer is Wrong!
The correct answer is of.
- At is used to indicate a specific time or place. For example, “He complained at the hospital.”
- Of is used to indicate possession or a part of something. For example, “He complained of chest pains.”
- On is used to indicate a surface or location. For example, “He complained on the phone.”
- Over is used to indicate a period of time or a distance. For example, “He complained over the weekend.”
In this case, the man is complaining about chest pains, which is a part of his body. Therefore, the correct preposition to use is of.