<p>Considering that space in the conference room is limited, the association members were advised to <strong>register</strong> for the conference event well in advance.</p>
<p>The correct answer is (C) <strong>register</strong>.</p>
<p>The word "advised" indicates that the association members were given a suggestion or recommendation. In this context, they were advised to do something in order to ensure that they have a spot in the conference room due to limited space.</p>
<p>The word "register" means to officially sign up or enroll for an event or activity. By registering for the conference event, the association members would secure their places in the conference room. This is the most appropriate action for them to take based on the limited space situation.</p>
<p>The other options are not as suitable:</p>
<p>(A) <strong>attend</strong> - This option implies that the association members should simply show up at the conference event. However, without registering in advance, they may not be able to attend if the conference room is already full.</p>
<p>(B) <strong>accommodate</strong> - This option means to provide or make room for someone or something. While it is important for the conference organizers to accommodate the association members, this is not an action that the members themselves need to take. They should register to secure their spots.</p>
<p>(D) <strong>arrange</strong> - This option means to organize or plan something. While the association members may need to make arrangements for their attendance at the conference event, the specific action they were advised to take is to register in advance.</p>