Chris receives a printed form in the mail from Wyandott Heating indicating that he has placed a telephone order for a $600 heater. He doesn't recall placing the order. Which of the following is correct?

a.Wyandott can hold Chris to the order.

b.Chris can hold Wyandott to the order.

c.Neither party is bound, because there is no signed writing.

d.Chris is bound if he makes no objection within 10 days.

Could you please explain the answer?