To find the change in the amount of water in gallons in 1 minute, we first determine how much water is removed per minute.
The pump removes 250 gallons in 5 minutes. To find the rate of removal per minute, we divide the total amount of water removed by the total time:
\[ \text{Rate of removal} = \frac{250 , \text{gallons}}{5 , \text{minutes}} = 50 , \text{gallons per minute} \]
Since the water is being removed, it results in a decrease in the amount of water in the tank, which we can denote as a negative change.
Therefore, the change in the amount of water in 1 minute is:
\[ \text{Change} = -50 , \text{gallons} \]
The correct response is:
−50