if each of the following for loop is executing the same type of instructions, which one is the least efficient

A$)$ for$($i $=0$; i $<$ n; i$++)$

B$)$ for$($i $=0$; i $<$ n; i $+=2)$

C$)$ for$($i $=1$; i $<$ n; i $*=2)$

D$)$ for$($i $=$ n; i $<=$ n; i $/=2)$