Final answer:
The M4 Carbine, when its butt stock is closed, has an approximate length of 29.75 inches, making it suitable for close combat situations.
Step-by-step explanation:
The correct answer is option: The M4 Carbine has a length of approximately 29.75 inches (75.5 cm) with the butt stock closed. The M4 is a selective fire, gas-operated, air-cooled, magazine-fed, shoulder-fired weapon with a collapsible stock.
It is widely used by the U.S. military and is known for its reliability and adaptability in various combat situations. Its compact size with the stock closed makes it particularly useful in close combat scenarios.