As the Fraction of the Industry's Labour Force That Is

As the fraction of the industry's labour force that is unionized_______ , the possibility for the ________ of non-union labour for union labour declines, reducing the ________
For union labour.

A) increases; differentiation; demand
B) increases; substitution; elasticity of demand
C) increases; substitution; elasticity of supply
D) decreases; combination; requirements
E) decreases; comparison; chance