The WAIS is the most widely used intelligence test; contains verbal and performance (nonverbal) subtests.

• A. Stanford-Binet
• B. IQ test
• C. Wechsler scale
• D. Wechsler Adult Intelligence Scale (WAIS)

Answer: (D)

The main idea here is recognizing the exact test name that matches a description of the most widely used intelligence measure with verbal and nonverbal (performance) subtests. The Wechsler Adult Intelligence Scale is the standard tool for assessing adult intelligence and is built around two broad types of tasks: verbal subtests that gauge language-based knowledge and reasoning, and performance subtests that assess nonverbal skills like perceptual reasoning and processing speed. This dual structure—verbal and performance components—is a hallmark of the Wechsler scales and is what the statement is describing. Among the options, the precise name that fits this description is Wechsler Adult Intelligence Scale (WAIS), since it specifies the adult version of the Wechsler scales. The broader “Wechsler scale” refers to the family as a whole, not this specific test, and the others are either generic or describe different instruments.