To find the change in the amount of water in gallons in 1 minute, we first determine how many gallons are removed in 1 minute.
The pump removes 250 gallons in 5 minutes, so we calculate the rate of removal per minute:
\[ \text{Rate of removal} = \frac{250 \text{ gallons}}{5 \text{ minutes}} = 50 \text{ gallons per minute} \]
Since the pump is removing water, the change in the amount of water is negative. Therefore, the change in the amount of water in 1 minute is:
\[ \text{Change} = -50 \text{ gallons} \]
So the correct response is:
−50