Question

shira looked up one night and saw a full moon. how long will it be before she can see a full moon again?
a about one week.
b about one month.
c there is no way to tell because the moon’s pattern is always changing.
d it could be two weeks or a month, depending on what time of year it is.

Explanation:

The lunar cycle (time between full moons) is about 29.5 days, approximately one month. A full moon repeats roughly every month. Option A (one week) is too short, C is incorrect as the lunar pattern is predictable, D's "two weeks or a month" is wrong as the cycle is ~a month.

Answer:

B. About one month.