Explanation:About tickets:Travelling tickets are used by people to go from one place to another.A travel ticket is obtained after booking a reservation.It gives various information about our travel, i.e. date, seat number, time of arrival etc.The cost of different travelling tickets is different.The cost of travelling ticket depends on the type of transport used, i.e. busses, trains, planes etc.The cost of a travelling ticket also depends on the distance on travel, i.e. regional, national or international.When using public transport we always have to buy tickets.Thus,A. The cost of travel by different means is different: CorrectB. The cost of travel depends upon the fuel used by the vehicle: IncorrectC. We need tickets to travel by public transport from one place to another: CorrectD. Understanding the reservation process: Incorrect