Answer
(a). Negative
(b). Negative
(c). Positive
(d). Positive
Work Step by Step
(a). It can be observed from the number line that $A$ is a positive number. If a positive number is multiplied by negative sign, the result is always negative.
(b). It can be observed from the number line that $B$ is less than $A$ as $A$ is to the right of $B$ on number line. If a larger number is subtracted from a smaller number, then the result is always less than zero or negative.
(c). It can be observed from the number line that $C$ is a negative number. If a negative number is multiplied by negative sign, the result is always positive.
(d). $A$ is positive in sign and has greater absolute value greater than $C$. As $A$ is to the right of $C$ on number line and positive, if a smaller number is subtracted from a larger number, then the result is always positive here.
