<p><span style="color: rgba(0, 0, 0, 0.87);">In this sentence, we are talking about a little store where stationery is sold. The subject of the sentence is "store," which is singular. Therefore, we need to use the singular form of the verb. </span><span style="color: rgba(0, 0, 0, 0.87);">Therefore, the correct answer is (A) "is."</span><br></p><div data-answer="a"><span><br></span></div><div data-answer="a"><span>(B) "are" is incorrect because it is the plural form of the verb and does not agree with the singular subject "store." </span></div><div data-answer="a"><span>(C) "will be" is incorrect because it refers to a future action, but the sentence is describing a situation that has been going on for twenty-five years, indicating a past action. </span></div><div data-answer="a"><span>(D) "being" is incorrect because it is a present participle form of the verb and does not fit in the context of the sentence. </span></div>