Select the phrase that best completes the sentence.

Kara’s mother wakes up at 5:30 A.M. every morning so she’ll have time to study for her college classes. This is the only time she has to study before she has to go to work. She takes college classes two nights a week. Every weekend, she volunteers at the local homeless shelter. She has been helping out there for the past three years.

From the information in the paragraph above, one can infer that Kara’s mother is probably ___________.