The correct answer is C. Overgeneralization
Step-by-step explanation
Overgeneralization is a type of fallacy in which the enunciator concludes from unproven premises. This type of fallacy can be identified because it uses words such as nobody, all, always, none, ever, never, every, among others that assume a situation is only in a certain way. In the case of the example, saying "Practically every teen cares about the welfare of animals" is overgeneralization because it is claiming every teen cares about this issue which might not be true in all situations also claiming "They may not know what they can do" is overgeneralization because this has been concluded without any evidence. So, the correct answer is C. Overgeneralization