The writer is considering replacing the underlined portion of sentence 11 (reproduced below). In one study, test subjects did a bunch of things with a humanlike robot called Nao.

Which of the following versions of the underlined text most closely fits the style of the passage?

A. (as it is now)

B. performed a series of tasks

C. finished a ton of work

D. completed loads of experiments

E. executed an array of assigned enterprises