Suppose Kellogg's, General Mills, and Post make the majority of breakfast cereal sold in the United States. If Kellogg's decides to decrease its prices by 10%,

a.more firms will enter the market due to low barriers to entry.b.Kellogg's will also decrease the variety of cereals it offers because of nonprice competition.c.the other firms in the industry will not change their pricing strategy because of the kinked demand curve.d.General Mills and Post will immediately respond because of mutual interdependence.