Certificate of Proficiency in English (CPE) Practice Test 2026 - Free CPE Practice Questions and Study Guide

The concept of lexical resource in the context of language proficiency specifically pertains to a candidate's range of vocabulary. This encompasses not only the number of words known but also their appropriateness, flexibility, and ability to convey precise meanings in various contexts. A rich lexical resource allows a speaker or writer to express ideas with nuance and clarity, demonstrating a higher level of language proficiency.

While the other options highlight important aspects of language ability, they do not capture the essence of lexical resource. The ability to denote words accurately is more about precision in word choice rather than the overall vocabulary range. Understanding grammar rules pertains to syntactic knowledge and sentence structure, which are separate from lexical resource. Lastly, the capacity to write essays relates to writing skills and the application of various language elements in composition, but it does not directly address vocabulary or lexical knowledge. Thus, the focus on the breadth and depth of vocabulary is what makes the choice about a candidate's range of vocabulary the most fitting answer regarding lexical resource.