What is the difference between a single-use motor and a reloadable motor?

What is the difference between a single-use motor and a reloadable motor?

• A. A reloadable motor is discarded after use, while a single-use motor is recharged with propellant charges.
• B. A single-use motor is discarded after use, while a reloadable motor uses a motor casing that is recharged with propellant charges.
• C. Both are reusable with little difference
• D. Both require replacement of electronics

Answer: (B)