I need these questions for my hw

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If it is impossible or very costly to prevent someone from beneting from a good even if the person does not pay for it, then the good is considered to be 0 nonrival O rival O nonexcludable O excludable A negative externality arises when O marginal private benefits are less than marginal social benefits. O marginal social costs are greater than marginal social benefits. O marginal social costs are less than marginal private costs. O marginal social costs are greater than marginal private costs. O marginal private benefits are greater than marginal private costs.After the first person the marginal cost of an additional person using a pure public good is O dependent on the number of individuals already using the good. O positive but very small. O zero. O equal to the price charged. O infinite.Free riders are not a problem in the market for a private good because 0 the good is a rival good. 0 non-payers can be excluded from consuming the good. 0 the free rider will not get caught. 0 the good can be produced only at a positive marginal cost