Tom is assessing whether he should commute to work by carpool or by bus. He concludes that the differential cost of busing option is $$50.$ What does this statement most probably mean? $($Work with only the facts provided in the problem and the framework discussed in the course without making any further assumptions$)$

A$.$

The cost of commuting by bus will increase by $$50$ next year.

B$.$

The sum of the costs of car pooling and busing options equal $$50$

C$.$

The cost of commuting by bus exceeds the cost of commuting by car pool by $$50$

D$.$

Tom can potentially save $$50$ by choosing to commute by bus.

E$.$

Instead of taking the bus, if he commutes by car pool, he will spend $$50$ more.