The correct plural form of the word in parentheses is :
B. Toothbrushes
"Parentheses"
The correct plural form of the word in parentheses after going to the dentist, Sarah threw away her old is Toothbrushes.
The toothbrushs is the wrong form of plural form of toothbrush.
When you utilize brackets to set off fabric in a sentence, you say that the fabric is “in parenthesis.”
Thus, the correct answer is B.
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