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Icredibly should be changed to incredible. That’s a spelling error
Answer: A
Explanation:
Well, you wouldn't say "Let's eat Grandma"
But you would write "Let's eat, Grandma!"
When you talk, you pause, right?
Try reading out loud a sentence and add a comma when it pauses, a period when it ends, and a semi-colon when the text gets too long but you have more to say; like I do for instance.