Abger electronics, a retail store, restructures its employees' schedules every six months. the employees are asked for their shift preferences, and the schedules are rearranged according to these preferences. when there is a conflict, those with the best total sales over the past six months are given priority. the following graph and table show the most recent sales records and employee preferences, respectively.
based on this information, when will each employee's shift begin?
a.9 a. m. - gary; 12 p. m. - rachel; 3 p. m. - christopher; 6 p. m. - hannah
b.9 a. m. - christopher; 12 p. m. - rachel; 3 p. m. - hannah; 6 p. m. - gary
c.9 a. m. - christopher; 12 p. m. - hannah; 3 p. m. - rachel; 6 p. m. - gary
d.9 a. m. - gary; 12 p. m. - rachel; 3 p. m. - hannah; 6 p. m. - christopher