<p>A common complaint among <b>dissatisfied</b> chip-card users is the slow transaction process, as shoppers wait for the EMV terminal to complete the transaction.</p><div data-answer="b">The correct answer is <span style="font-size: 13.008px;">(B) dissatisfied.</span></div><div data-answer="b"><span style="font-size: 13.008px;"><br></span></div><div data-answer="b"><span style="font-size: 13.008px;">In this sentence, we are describing the users of chip-cards and their complaint about the slow transaction process. </span><span style="font-size: 13.008px;">The word "among" indicates that we are referring to a group of chip-card users. </span><span style="font-size: 13.008px;">The adjective "dissatisfied" correctly describes the users who are experiencing the slow transaction process. This adjective is in the past participle form, which is used to describe the feelings or opinions of the chip-card users.</span><span style="font-size: 13.008px;"> </span></div><div data-answer="b"><span style="font-size: 13.008px;"><br></span></div><div data-answer="b"><span style="font-size: 13.008px;">The options (A) dissatisfying, (C) dissatisfy, and (D) satisfactory do not fit the sentence. </span></div><div data-answer="b"><span style="font-size: 13.008px;"><br></span></div><div data-answer="b"><span style="font-size: 13.008px;">(A) Dissatisfying is the present participle form of the verb "dissatisfy," which is used to describe an action. It does not correctly describe the users' feelings or opinions.</span></div><div data-answer="b"><span style="font-size: 13.008px;">(C) Dissatisfy is the base form of the verb "dissatisfy," which is used to indicate an action. It does not correctly describe the users' feelings or opinions.</span></div><div data-answer="b"><span style="font-size: 13.008px;">(D) Satisfactory is an adjective that means acceptable or adequate. It does not correctly describe the users' feelings of dissatisfaction with the slow transaction process.</span><br></div>