From the word lettered A to D, choose the word that best completes each of the following sentences
He was given a certificate of....in English.
Answer Details
The word that best completes the sentence is "proficiency".
Explanation:
Certificate of proficiency is a formal recognition given to a person who has achieved a certain level of competence or skill in a particular area. Therefore, the word "proficiency" which means a high level of competence or skill in a particular area, is the most appropriate option that fits into the sentence. The other options - efficacy, efficiency, and sufficiency - do not convey the intended meaning in the given sentence.