The most important subject for (their,<u> them</u>) was how to plant
<h2>Noun and Pronoun :</h2>
By definition, a noun is just defined as a name of a person, animal, place or things. Example of nouns included Peter, Paul, Sophia, Cat, Table, New York, Texas, e.t.c
Now,a Pronoun may be a subcategory of nouns and it is simply a word that can replace a noun to avoid repetition. for instance , rather than calling someone by his name like Peter, you'll say;
Peter wants to return but "he" said he is tired. So we see that the word he has replaced Peter to avoid repetition.
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The long-line structure allows him to include a list.
A would be the answer, Tomas was frustrated during class he forgot his book report. I believe there should be a comma in between class and he