‘R’ will be the first part of the given sequence as it contains theobject, that is, ‘a speeding truck’. ‘P’ and ‘Q’ will follow logically asthey complete the action by further describes the truck. ‘S’ will follow ‘Q’ as it tells the reaction of the subject when the action wascompleted. Hence, RPQS is the correct sequence. Thus, option (a)is correct.