Comments are useful for:

a. specifying the intent of the program specifying how the interpreter should handle non-standard Python statements.
b. specifying which Python libraries the interpreter should use.
c. making a bunch of meaningless remarks that confuse programmers.
d. specifying the intent of the program.

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.