Your answer would be B. 247 ft². This is because if you draw the prism out, you can use the dimensions to find the individual surface areas, and then add them together.
So you would do 10 × 6 = 60, and then multiply it by 2 as there are two of each side to get 120 ft². 6 × 4 = 24, and then multiplied by 2 = 48 ft². 10 × 4 = 40, multiplied by 2 = 80 ft².
Then when you add together 120, 80, and 48, you get 248 ft². I hope this helps!
