what is a reasonable estimate of −3 4/5 + (−5.25) and the actual value?

A. −3 + (−5) = 8; 8 1/20
B. −4 + (−5) = −9; − 9 1/20
C. −4 + (−5) = −1; − 8 9/20
D. 3 + (−5) = −8; − 8 1/20