Answer:
I think it would be B correct me if wrong
Answer:
Make sure to add the worksheet or document with the question so we can asnwer it properly!
Explanation:
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.
It is Subjunctive. Conditionals use "If"
