Which two signs and two numbers should be interchanged in the following equation to make it correct?
`8 +15-20 xx 10 div 5 =47`

Options

A. `xx and -, 15 and 20`
B. `+ and div, 10 and 20`
C. `xx and div, 5 and 8`
D. `+ and -, 8 and 15`

Answer

4