Poor balance can be a sign of a. poor concentration. b. weak core muscles. c. the selection of the wrong type of exercise. d. the need for corrective lenses.

option B. weak core muscles.

Core muscles are fundamental to keep posture, resist forces without changing your position and resist forces that change your plane of motion.

So, it is inferred that weakness of core muscles would cause poor balance. Disciplines like yoga and pilates focus on exercises to strengthen core muscles to gain good balance.

Having good balance is important to avoid injuries due to falls, to be more active and able to perform daily activities: walk, climb stairs, play with children, play sports, hiking, among others.

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.