To determine how much the candle loses in height each hour, we can perform the division \((-96) ÷ 4\).
Calculating this:
\[ -96 ÷ 4 = -24 \]
This means that the candle loses 24 millimeters in height each hour. Therefore, the correct response is:
\[ (-96) ÷ 4 = -24; \text{ The candle loses } 24 \text{ millimeters in height each hour.} \]