The most appropriate options seem to be "He should raise his hand to indicate that he wants to enter the conversation" and "He should take notes reminding himself to do research on shipping later".
Louise was addressed the logistics and the timing of the operation before getting interrupted by Mark, who brings up a valid point regarding time constraints that could deny the possibility of getting enough money to carry on with the plan. However, Louise clarifies exactly how much money they would need after considering some savings they already had at their disposal.
They're both focused on the topic at hand and actively participating, the only mistake Mark makes that seems to annoy Louise is that he interrupted her. In addition, Mark could help the situation by doing some extra research about the shipping later, without interrupting the flow of the discussion or compromising the schedule.
