- AOnly assumption I is implicit
- BOnly assumption II is implicit
- CNeither I nor II is implicit
- DBoth I and II are implicit
Step-by-Step Solution
Raising a parking fee can cut congestion only if drivers respond to the higher cost by driving in less often (I). It can also work only if a good share of the incoming vehicles actually park in that area, since a fee reaches nobody else (II). Both are taken for granted by the measure.
Answer: D) Both I and II are implicit