Today, two-thirds of Poland is

a.

open farmland.

c.

covered by forest.

b.

populated by Roman Catholics.

d.

reserved for the mining of coal and copper.

It's option B

Populated by Roman Catholics

a. open farmland.

Explanation:

The Poland is a country that is located in the central Europe and is divided into 16 administrative units and that covers about 312,696 km square and has a largely temperate seasonal climate and about 30% of the land is covered by the forest and their percentage is still increasing and will continue to increase by 2050.