According to the Text, the Coal Miners' Union Has Recently

According to the text, the coal miners' union has recently been facing difficulties primarily because of

A) the strong economy in the United States raising the MRP of coal miners
B) high world demand for coal causing international competition
C) wages falling due to an increase in the number of union jobs
D) a shift from coal to other energy sources
E) union officials that have illegally drained union assets