AhmedNazir

Call

Option 3 : Only I and II are implicit

In the given question,

Assumption I :  The pollution level in the city in the future may reduce after these factories are shifted outside the city limit - Implicit, as the plan for shifting industries, is being done keeping this assumption in mind.

Assumption II : Enough usable land is available outside the city limit for these factories - Implicit, since it has been decided then it's an implicit assumption that land is available for factories to be established.

Assumption III : Many of these factories may shift to some other smaller towns to remain profitable - Not implicit.

Therefore, Option 3 is the correct answer.