By explaining problems and giving solutions! this is the best fit because the other two might make sense at a first glance, but only explaining problems and solutions would be an effective way to teach people how to set up an aquarium by giving them examples of what to do and what not to do whereas the others are just him talking about his aquarium.
The word that correctly completes the given sentence above would be driving. The complete sentence is: They will be driving to Chicago next week. The verb takes the -ing form, which is the simple future tense of the verb because the action indicates that it will be done some time in the future and is not yet started.
The subject of a sentence is who or what is doing the action. The predicate explains the action. ... A predicate nominative is a noun that completes the linking verb in a sentence. Predicate adjectives complete the linking verb by describing the subject of a sentence.
The answer is C. Disapproving
