Arthur Had Trouble Locating the Top Quality Tomatoes That His

Arthur had trouble locating the top quality tomatoes that his customers wanted in their marinated tomato salads.When he could find no vendor to supply the tomatoes necessary for the salads,he invested in a farm in southern California to produce the tomatoes.Arthur engaged in:

A) horizontal integration
B) market expansion
C) co-operative buying
D) market penetration
E) vertical integration