Identify the correct sentence or sentences. Check grammar, usage, semantics, mechanics, redundancy, punctuation, spelling and style elements.
A. Upon entering the restaurant, the maître dhôtel handed us a menu.
B. Working diligently and carefully, the faucet was fixed in no time at all.
C. Employing ground breaking techniques in alternative medicine, the patients health improved in a few days.
D. David tried a handful of desserts from the table, which ultimately gave him an upset stomach.