Here's a problem to solve: In which situation would it be an advantage to ship a product by plane rather than by truck?

Among the 4 following options, which is the correct answer?

- A: The product is very heavy and relatively large.
 
- B: The product is sensitive to changes in pressure.
 
- C: The product must be delivered a long distance soon after it is made.
 
- D: The product must be delivered to several sites located within a radius of 50 miles.
 