If he is going with the descriptive investigation approach, everything will mostly be done qualitatively. This approach does not focus on the conclusive result of the study. Instead, it focuses on the detailed path to get to an effective analytical tools, approach or methodolody towards the conclusion.
Thus, with descriptive investigation, you could trim out unnecessary approaches and single out the effective ones. In this way, you will maximize your resources in a short period of time. Thus, the answer is choice A.
That the person is nervous, restless and is probably uncomfortable. I think the tone would be tense and maybe a little agitated? the person is probably worried about something. sorry if this isn't what you needed but I hope it helps :)
The correct answer is letter b: simile. This literacy device compares two different things using the words "like" or "as". In this play the author is using a simile in the the statement "His beard was as white as snow".