The question is a bit vague indeed, but I'd say that the correct option is B, because the other options are very likely to produce some bias.
If you choose choosing everyone in the drama club, you know that you will select people with something in common, i.e. the love for drama.
If you choose the first 10 people you see, they will likely live in your area. So, for example, if you live in a very poor/rich/peculiar area, the first 10 people you see will share that aspect.
If you ask for volunteers, you risk losing people from a certain category. For example, if your sample is needed for psychological research, shy/introvert people probably won't participate.
Instead, picking random people from phone book should keep you safe from these biases
