Which of the Following People Would Be Most Likely to Help

Which of the following people would be most likely to help Gita study for her history exam?

A) Gita's older brother,who probably has nothing better to do that evening
B) Gita's mother,who is excited about the unexpected bonus she just received from her employer
C) Gita's father,who always points out how differently men and women think and act
D) Gita's younger sister,whose boyfriend just canceled their date for the next evening