McDonald's Has Made Aggressive Moves to Gain Market Share in the Coffee

McDonald's has made aggressive moves to gain market share in the coffee market.This is an example of ________,while the opening of Nordstrom stores in Canada is an example of ________.

A) substitutes;threat of potential entrants
B) threat of potential entrants;buyers
C) buyers;suppliers
D) suppliers;rivalry among existing competitors
E) rivalry among existing competitors;threat of potential entrants