Final answer:
Sarah used a scale of 1 inch = 4.5 feet for her scale drawing of a dinosaur, which makes the correct answer B.
Step-by-step explanation:
Sarah made a scale drawing of a dinosaur with a height of 2 inches, while the actual dinosaur is 9 feet tall. To find the scale that Sarah used for her drawing, we need to convert feet to inches, knowing that 1 foot is equal to 12 inches.
So, 9 feet is the same as 9 x 12 inches, which equals 108 inches. Now, we need to compare the scale drawing's height with the actual height. Since the drawing is 2 inches and the actual height is 108 inches, this means that 1 inch of the drawing represents 108 inches / 2, which is 54 inches or 4.5 feet. Thus, the scale used is 1 inch = 4.5 feet.
Therefore, the correct answer is B. 1 in. = 4.5 ft.