Jose Runs a Gallery Which Specializes in Neon Art with an Emphasis

Jose runs a gallery which specializes in neon art with an emphasis on vacation icons like flamingos,dolphins,and palm trees.Since demand was high,and supplies were low,he decided to buy an old warehouse,and then hire craftspeople to work there in order to produce the art.He would provide them with all of the supplies they needed,and he would be their only customer.Jose engaged in:

A) Horizontal integration
B) Market expansion
C) Co-operative buying
D) Market penetration
E) Vertical integration