The correct answer is A. Mopeds (motorized bicycles) first became popular in Europe
Explanation:
In grammar, parentheses () are one type of punctuation mark mainly used during sentences, paragraphs and texts to introduce information that explains or provide extra information about a word, concept or phrase previously mentioned this includes comments, brief explanations or examples. Additionally, the information parentheses enclose is not grammatically connected to the rest of the sentence, which make the use of parentheses different from the use of commas and other punctuation marks use to add extra information. Considering this, the choice that show the correct use of parentheses is "Mopeds (motorized bicycles) first became popular in Europe" because in this option the extra information or short explanation "motorized bicycles" is enclosed in the parenthesis, also this information does not grammatically belong to the main sentence which makes the use of parentheses correct.
