The answer is B (-∞, 6.25]. just comment if u would like an explanation
The range is basically all the possible y values. as we can see on the graph, the y values only go up until 6.25, so we know that is the maximum. However, the 'arms' of the graph will go on forever into the negative y values. and that's why we say it is from -∞ to 6.25. Also to note:the square values indicate that 6.25 is the set value, so it can only be lower or equal to that value and the curved bracket () indicates that it doesn't have a set value.
Hope u understand