The correct answer is D. All of the above.
Insurance works on the principle of trust, sharing, and randomness.
Trust is essential for insurance to work. The insured must trust the insurer to pay out claims when they are due, and the insurer must trust the insured to be honest about their claims.
Sharing is also essential for insurance to work. The insured and the insurer share the risk of loss. The insured pays a premium to the insurer, and the insurer agrees to pay out claims if the insured suffers a loss.
Randomness is also essential for insurance to work. Insurance is designed to protect against losses that are unlikely to happen to any one individual, but are likely to happen to someone in the group. For example, car insurance protects against accidents, which are unlikely to happen to any one driver, but are likely to happen to someone in the group of drivers who are insured.
Without trust, sharing, and randomness, insurance would not be possible.