What is the primary difference in fire-control options between the M4 carbine and M16 rifle?

• A. M4 typically offers semi-automatic and full-automatic firing modes (depending on variant), while M16 variants historically offered semi-automatic and three-round burst; many M4s do not have burst capability.
• B. M4 offers semi-automatic only; M16 offers semi-automatic and full-automatic.
• C. M4 offers three-round burst; M16 offers semi-automatic and full-automatic.
• D. M4 and M16 both offer semi-automatic and full-automatic in all variants.

Answer: (A)