Specific weight of water in S.I. units is equal to ________________?

Specific weight of water in S.I. units is equal to ________________?

A. 1000 N/m3
B. 10000 N/m3
C. 9.81 xlO3 N/m3
D. 9.81 xlO6N/m3
E. 9.81 N/m3