Final answer:
The correct answer is 'c. Full-face helmets' which offer full coverage of the head and face, including the chin area that is not covered by other helmet types like open-face or half helmets.
Step-by-step explanation:
Full coverage helmets are designed to provide extensive protection to the wearer, particularly for motorcyclists. The question refers to the types of helmets and asks which of the given options is also called a full coverage helmet. The correct answer to the given question is "c. Full-face helmets." Full-face helmets offer coverage for the entire head and face, including the chin area which is not protected by open-face or half helmets. Modular helmets, often referred to as convertible or flip-up helmets, offer a mix of features from full-face and open-face helmets, with a front section that can be pushed up. Options a, open-face helmets, and d, half helmets, provide less coverage than full-face helmets. A full-face helmet ensures maximum safety by fully enclosing the head and face. Choosing the right type of helmet is crucial for safety and protection while riding motorcycles or engaging in other activities where head protection is required.