Final answer:
To write a rate as a unit rate, divide the quantity in the numerator by the quantity in the denominator. The unit rate for this question is 108 calories per ounce.
Step-by-step explanation:
To write a rate as a unit rate, divide the quantity in the numerator by the quantity in the denominator. Let's go through each option:
A) 756 calories per 7 ounces = 108 calories per ounce
B) 108 calories per ounce = 108 calories per ounce
C) 7 ounces per 756 calories = 1 ounce per 108 calories
D) 1 ounce per 108 calories = 1 ounce per 108 calories
Therefore, the unit rate is 108 calories per ounce, which is option B.