Which of the Following Are Examples of Erosion? I

Which of the following are examples of erosion? I.The loss of sales due to increased competition in the product market.
II) The loss of sales because your chief competitor just opened a store across the street from your
Store.
III) The loss of sales due to a new product which you recently introduced.
IV) The loss of sales due to a new product recently introduced by your competitor.

A) III only.
B) III and IV only.
C) I, III and IV only.
D) II and IV only.
E) I, II, III, and IV.