Individuals need to adjust their physical activity to account for as they age.
a. reduced flexibility
b. decreased energy levels
c. a loss of balance
d. all of the above

explanation:

daily refers to frequency, like weekly or monthly. take this medicine twice daily, once in the morning and again at bedtime. on a daily basis there refers to everyday life, to one's normal or usual behavior, activity, routine, or schedule, to the quotidien.

answer (c) by causing social withdrawal;