Answer: Choice A (20 yards)
Explanation:
Bobby's football team received four five-yard penalties in the first quarter, which means they lost 4 x 5 = 20 yards in total.
The team started at the 45-yard line, which means they had 45 yards to go until the goal line.
The team ended at the 25-yard line, which means they had progressed 45 - 25 = 20 yards down the field.
However, they lost 20 yards due to penalties, so their actual progress down the field was 20 - 20 = 0 yards.
Therefore, the change in their progression down the field as a result of these penalties is -20 yards (choice A).