The glycemic index predicts the way certain foods affect
a. blood sugar levels.
b. exercise performance.
c. blood pressure.
d. weight loss.

The answer is letter A.

The glycemic index predicts how the blood sugar levels are working within the body. It is a list of carbohydrate-containing foods with their respective sugar content and how it directly affects blood sugar. It is commonly used by diabetic patients to keep track or keep record of their daily food intake. This is an effective way to prevent further aggravation of high sugar in the blood in individuals. Nutritionists are usually the ones responsible for determining glycemic index for diabetic patients.

Ibelieve this would be an obstacle.

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.