The least reliable of the employment tests are those that attempt to measure a person’s: A. temperament. B. manual dexterity. C. speed of limb movement. D. reaction time.

The answer is A. temperament. Employment tests that attempt to measure a person's temperament tend to be the least reliable because they are subjective and open to interpretation. Temperament is a person's natural disposition, making it difficult to measure accurately with a test. In contrast, tests that measure manual dexterity, speed of limb movement, and reaction time are more objective and easier to measure accurately. These tests are often used in industries that involve physical labor or require quick reflexes, such as manufacturing or driving.