The "Interest in Existing" argument holds that

A) It is sometimes better to exist in a coma than not exist at all.
B) It is better to be alive than not exist in some cases.
C) Euthanasia is wrong because it kills an existing person.
D) We have a duty to reproduce as much as possible.

The "Interest in Existing" argument asserts that it is better to exist than to not exist. This argument is often used to support the idea that it is better to be alive than to undergo euthanasia or to never have been born. However, it does not necessarily support the idea of reproducing as much as possible, as the focus is on the individual's interest in their own existence rather than the overall population. Choice A, that it is sometimes better to exist in a coma than not exist at all, is a specific application of this argument rather than the general idea. Choice C is partially correct in that the argument does emphasize the value of existing individuals, but it does not necessarily imply that euthanasia is always wrong. Finally, choice D is not supported by the "Interest in Existing" argument.