Question

on account of his infirmities he is disqualified_competing examination.fill in the blanks with appropriate preposition (from, of, in)​

Answer 1

on account of his infirmities, he is disqualified from competing in examinations.

Prepositions in English Grammar

• Prepositions are small English words used to complete a sentence by connecting nouns or proper nouns with the sentence.
• These words are also used to introduce an object and show time, direction, and location.
• Right prepositions are a must in order to make the sentence correct.
• Some examples of prepositions are: off, of, upon, from, etc

So the correct option will be from.