Correct option 4.Both arguments are strong. The passage asks if the online mode of learning should perpetuate? Argument I supports the move and states that it is a cost-effective mode of learning and should therefore continue. Assorted costs that arerelated to transport, maintenance, security, etc. are reduced making it considerably inexpensive. Therefore,argument I is strong. Argument II opposes the move. Since students are not a part of an environment which aids learning with the co- mates, continuingwith it may not be very effective. Therefore, argument II is strong. Hence, option 4 is correct.