Final answer:
Glass insurance typically covers breakage of glass but not damage from fire, war, and nuclear hazards. Scratching and defacement coverage usually requires an additional premium.
Step-by-step explanation:
The option that best describes Glass insurance and its coverage is (a) Fire, war, and nuclear damage is not covered. Glass insurance policies generally provide coverage against breakage of glass but often exclude damage from events such as fire, acts of war, and nuclear hazards, which are typically not covered under a standard glass insurance policy. Depending on the policy, coverage for scratching and defacement might be available, but it would likely come with an additional premium, which counters options (b) and (c) that suggest scratching is covered without additional cost or covered in general.