Everything at the small sit-down dinner party has gone beautifully. You go to finish off the evening with a flare by bringing in the customer's fondue pot, which you filled with melted chocolate and plugged in to keep warm several minutes ago, while you chopped up the fresh fruits to dip in it. Now the chocolate has hardened! What did you most likely do wrong?

A. You didn't get the timing right.
B. You hired the wrong assistants.
C. You failed to check the equipment during the site visit.
D. You bought the wrong chocolate.