Which of the following sentences has no grammatical errors? *

A. By concentrating reaction mixture under reduced pressure, quenched with ice water and saturated aq. NaOH, and the organic material was extracted three times with ethyl acetate.

B. Concentrated reaction mixture under reduced pressure, quenched with ice water and saturated aq. NaOH, was followed by the organic material being extracted three times with ethyl acetate.

C. After the reaction mixture was concentrated under reduced pressure and quenched with ice water and saturated aq. NaOH, the organic material was extracted three times with ethyl acetate.

D. Extraction of the organic material three times with ethyl acetate was preceded by the reaction mixture was concentrated under reduced pressure, quenched with ice water and saturated aq. NaOH.