In which of the following pairs are both substances deliquescent?

A. CaCI2 and H2SO4
B. NaOH and MgSO4 7H2O
C. CaCI2 and NaOH
D. CUO and NaCI
E. CaCO3 and MgCI2

Correct Answer: Option C

C. CaCI2 and NaOH