Identify Gause's Competitive Exclusion Principle from the following.

• A
  The feeding efficiency of one species may be reduced due to the interfering and inhibitory presence of the other species.
• B
  The fitness of one species is significantly lower in the presence of another species.
• C
  Two closely related species competing for the same resources cannot coexist indefinitely.
• D
  This type of life ensures a non-expensive arrangement for living and eating.