Zuckerman assessed his research with the use of

A) questionnaires.
B) multiple observations.
C) random sampling.
D) case studies.

Questionnaires

A set of printed or digital questions designed to gather information from respondents for research or assessment purposes.

Random Sampling

A method of selecting a sample from a population in which every member has an equal chance of being included, ensuring the representativeness of the sample.

Multiple Observations

The act of repeatedly viewing or noticing the same event, behavior, or phenomenon, often used in scientific research to increase reliability.