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.
Answer is B
A just gives off what happens
C was gives off it was in the past
D gives off what they need to expect in the future
Answer:
what's the question about?
simple
compound
compound
simple
compound
simple
simple
?
compound
For 18-21, you just need to add for, and , but, nor, or, yet and add another sentence
Answer: Apostrophe
Explanation: The apostrophe character in the English language is used for marking the skip or one or more letters and when we are marking possessive nouns. This is a punctuation mark and it is shown as - '
Examples of an apostrophe when it's applied to contractions: are and not are making aren't or for example they and have will make they've with an apostrophe
