John Has Invented a Device to Monitor the Tire Pressure

John has invented a device to monitor the tire pressure on bicycle tires.This device consists of a tire pressure sensor on the tire with a radio transmitter and a receiver mounted on the handlebars to give a readout of the pressure.The radio transmitter is similar to existing designs,but one has never been used in this way.The product cannot be produced for less than $120,but John's preliminary marketing studies indicate that the product could not be sold for more than $25.Which of the following is true?

A) John cannot get a patent because the transmitter part is not a new invention.
B) John cannot get a patent because the inability to produce the product at a cost low enough to sell it means that it does not meet the usefulness requirement.
C) John can get a provisional patent that would provide limited protection until he can redesign it so that it can be made for under $25.
D) John can obtain protection for his invention even if someone else files a patent application for the same invention so long as John actually invented his first.