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.

Step 1: Analyze the question We need the word that best fits: "He was given a certificate of .... in English."

Step 2: Understand the words

• Efficacy: the ability of something to produce a desired result, usually said of medicines or methods (e.g., "the efficacy of the drug").
• Efficiency: working in a well-organised way without wasting time or resources (e.g., "the efficiency of a machine").
• Proficiency: a high level of skill or competence in a language, subject, or activity.
• Sufficiency: the state of being enough or adequate (e.g., "sufficiency of food").

Step 3: Apply to the sentence A certificate given "in English" shows that a person has reached a certain level of skill in the language. This is the meaning of proficiency. We commonly say "a certificate of proficiency in English", as in the language proficiency tests used by universities and employers.

The other options don't fit:

• Efficacy applies to treatments or methods, not language skill.
• Efficiency applies to how well work is organised, not skill in a language.
• Sufficiency means "enough", which makes no sense here.

Step 4: Answer The correct option is C. proficiency.

Tip: Link proficiency with professional and skill. If a question mentions a certificate in a language or subject, think "proficiency". Also remember that efficacy goes with medicine, and efficiency goes with work or machines.