Which two signs and two numbers should be interchanged to make the given equation correct?
`45 - 87 xx 20 div 5 + 29 = 50`

Options

A. 29 and 45, + and `-:`
B. 20 and 29, `-: and xx`
C. 20 and 29, `-: and +`
D. 45 and 5, `xx` and –

Answer

B