Answer:
D. This riddle was solved by the youngest student in the group.
"I wrote extra r's at the end of roarrr to show the sound the lion made" is the sentence that correctly forms the plural of the letter "r". This is almost always done with apostrophes.
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Answer:
They could be combined for example, Last night, Nemo painted fifty banners for the school election, that is why his jeans are so dirty today.
That would work better than just two sentences
Hope this helps