Answer: D 56 years old
Explanation:
For a 56 years old, her son is maybe in college already. So seeing her son graduate from college is a matter of 2, 3 or 4 years at most. So it is a short term goal
For a 6 years, who is in preschool that seen like future dream that will take at least 36 years. It is long term goal
For a 16 years, who is still in high school it is a long time dream that will take at least 20 years, it is a long tern goal
For a 26 years, who probably just had a child it is a long term goal