A:whether
B:that
C:if
D:Why
2.33×0.5×0.4×5=____
0 + 10 <2 5
1.3 + 8.7 <2 5
2 + 8 <2 5
4.6 + 5.4 <2 5 ,
5 + 5 ≤2 5 .