How often did the small theater company do a new play

A．When crop failure caused depression.
B．When the autumn harvest had just been completed.
C．When the wheat prices became increasingly high.
D．As soon as the Winnipeg Grain Exchange demanded payment:

A．Where the oil spill occurred.
B．What caused the oil spill.
C．How the oil spill was handled.
D．The number of volunteers who came to help.