Which of the following individuals was instrumental in the early research examining fitness levels in depressed patients?

A. Robert Cattell
B. William Morgan
C. Hans Selye
D. James Blumenthal

To find out which of the individuals was instrumental in the early research examining fitness levels in depressed patients, we need to do a little research.

One way to approach this is by searching for information about each individual mentioned: Robert Cattell, William Morgan, Hans Selye, and James Blumenthal. By doing so, we can gather information about their backgrounds and achievements, helping us determine their involvement in this particular area of research.

You can conduct a search using a search engine like Google or Bing. Type in each name, one by one, and then add relevant keywords such as "research on fitness levels in depressed patients" or "contribution to understanding fitness and depression." This will yield results specific to each individual.

By examining the search results, you should be able to identify any notable contributions made by these individuals to the field of research on fitness levels in depressed patients. Look for articles, studies, or scholarly papers that mention their involvement or mention particular research studies they conducted.

Remember to critically evaluate the sources to ensure their credibility and reliability. Scholarly articles, academic journals, or reputable research institutions are often reliable sources of information.

Once you have gathered information about each individual's background and contributions, you can compare them to determine which person was instrumental in the early research examining fitness levels in depressed patients.