Choose the most appropriate option to change the voice (active / passive) form of the given sentence.

Trishika consumed the skimmed milk stored in the refrigerator for 3 days.

a) The skimmed milk stored in the refrigerator for 3 days was drunk by Trishika.
b) The skimmed milk stored in the refrigerator for 3 days had been drunk by Trishika.
c) The skimmed milk stored in the refrigerator for 3 days has been drunk by Trishika.
d) The milk stored in the refrigerator for 3 days was drunk by Trishika.