After some analysis and comparison work, scientists became sure that Skhul shells could be over ______.

A．He told the woman to take seven courses this semester.
B．He knew that the woman’s schedule would be too difficult for her.
C．His current schedule is also very demanding.
D．Taking so many classes will enable the woman to graduate early.

A．They were happy.
B．They were calm.
C．They were satisfied.
D．They were sad.