Answer
$(A)$ negative
$(B)$ positive
$(C)$ positive
$(D)$ negative
Work Step by Step
$a \gt0$ meaning it is positive meaning $a = +$
$b \lt0$ meaning it is positive meaning $b = -$
$c \lt0$ meaning it is positive meaning $c = -$
$(A) -(+) = -$
$(B) (-)(-) = +$
$(C) (+) - (-) = +$
$(D) (+)(-) + (+)(-) = -$
