2) Without the prairie dog populations in the range of the black-footed ferret, the ferret population began to decline. But what happened to
the prairie dogs? ALL BUT ONE could be a reason for the disappearing
prairie dogs

A)Global warming effects of mid-western climate.

B)Grassland being converted into agricultural land.
C)Competition among prairie dogs for decreasing food
supplies.
D)Increased human population that added towns, cities
and highways.