The Price of Celery Rises, but Nothing Has Changed on the Supply

The price of celery rises, but nothing has changed on the supply side of the market. What does this mean to celery farmers?

A) Celery production should be increased because the number of producers has fallen.
B) Celery production should be reduced because the number of producers has risen.
C) It is a signal that celery is more valuable to consumers than it was before.
D) It is a signal that they should reduce celery production because it is too expensive for consumers.