"Put all your eggs in just one basket" in the last paragraph comes from a famous idiom and it is"______".

A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.

A．Mary earned the prize.
B．Mary has granted the prize..
C．Mary fails in the speech contest.
D．Mary shouldn’t earn the prize.