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

A

$$\times and \div $$, 5 and 8

B

$$+ and -, 8  and  15$$

C

$$ + and \div  $$, 10 and 20

D

$$ \times and - $$,15 and 20