Which of the Following Might Be Considered the Most Accurate

Which of the following might be considered the most accurate description of what it means to "do," to "teach," and to "learn" mathematics?

A) Mathematics is all about memorizing rules and procedures.
B) Mathematics primarily involves students learning to manipulate symbols, such as numbers and variables.
C) Mathematics is a process with very little content to be learned.
D) Mathematics is a verb - something that one does - as well as a large body of content to be learned.
E) Mathematics only exists inasmuch as it connects to other subjects, such as biology or social studies.