One Difference Between the Demand for a Private Good and That

One difference between the demand for a private good and that for a public good is that

A) with a private good, each consumer chooses the quantity she wants to consume but with a public good, each consumer chooses the price she is willing to pay for a fixed quantity.
B) with a private good, each consumer chooses the quantity she wants to consume but with a public good, everyone consumes the same quantity.
C) with a private good, each consumer receives different amounts of benefit from consuming the product but with a public good, every consumer realizes the same amount of benefit from consuming the product.
D) the marginal benefit from consuming the last unit of a public good always exceeds the marginal benefit from consuming the last unit of a private good because there are externalities in the consumption of the former.