Given the list at the end of the sentence, focus on whether the list items are parallel. As written, they are not: "by choosing..., submitting, or they select..." If "they select" were replaced by "selecting," the items would be parallel. Eliminate (A).

The list items in (B) are parallel, but "are making" is incorrect compared to "make" in the other choices. (C) uses "make" and all three verbs are parallel, but the use of the word "by" before "selecting" is wrong: "choosing..., submitting..., by selecting." (D) repeats that mistake. (E) corrects all of these errors, and is correct.