Final answer:
Fredrick W. Taylor analyzed worker activities through time-motion studies for improving efficiency in the workplace, as part of his scientific management theory outlined in his book, The Principles of Scientific Management.
Step-by-step explanation:
The individual who analyzed worker activities through films and is renowned for such time-motion studies is Fredrick W. Taylor. Taylor is hailed as the father of scientific management, and he put forth his theory in his seminal work, The Principles of Scientific Management, published in 1911.
His firm belief was that careful study of every component of the production processes would lead to better efficiency by identifying and eliminating unnecessary steps and wasted motion. He notably used stopwatches in what was referred to as "stop-watch management" to break down tasks into smaller segments, ultimately aiming for increased industrial efficiency through improvements in human productivity.
Therefore, the correct answer to the question is a) Frederick Taylor.