D. After he worked hard waiting tables all week, John was shocked when he saw his tiny paycheck.
Explanation: Option A still uses the informal language of "busted it" and "freaked out", so it is incorrect; Option B uses "freaked out", so it is also incorrect; Option C uses "busted it", so it is incorrect as well. This only leaves Option D as a viable answer, which uses neither "busted it" or "freaked out", so it must be correct.