A scale that measures a fair sample of the tasks and skills actually needed for the job in question is known as:

Correct option is C

Content validity is a type of validity that focuses on whether a measurement or assessment tool adequately represents the content domain it is intended to measure. In the context of job analysis and selection, content validity ensures that a job assessment, such as a test or questionnaire, accurately reflects the knowledge, skills, abilities, and other characteristics required for successful job performance.
Content validity is established by thoroughly analyzing the job tasks, responsibilities, and requirements to develop a comprehensive assessment that covers a representative sample of the content domain. This ensures that the assessment provides an accurate and fair representation of the job-related factors being measured.
Test validity refers to the degree to which a test measures what it intends to measure.
Criterion validity refers to the extent to which a test or assessment tool accurately predicts or correlates with a specific criterion, such as job performance.
Construct validity refers to the degree to which a test measures an underlying construct or theoretical concept.