It is B, you are finding the infinitive as a direct object, in the answer B "to drink water" is the infinitive.
In dramatic structure, I think dialogue is used to appeal to the reader by making he/she feel like they are actually there and to just bring it to life. Hope that helps.
Conclusions made on the basis of unstated or stated evidence are called <span><span>inferences.</span></span>
Its the second one, a valley! Hope this helps :)