DeAndre is coding a program for a school project. He uses pre-built Python modules to save himself some time. But when he runs his program, he receives an error. What has he most likely done wrong?

A.
He has not saved his code before running it.

B.
He forgot to put the names of the modules in all uppercase letters.

C.
He forgot to import the library that the modules came from.

D.
He forgot to print the results of the modules.