Amazon $\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ disrupts the brick$-$and$-$mortar music industry by selling music online.

a$.$

New entrants that used the power of new entrants to

b$.$

Buyer that used the power of buyers to

c$.$

Rival competitor that used the power of rival competitors to

d$.$

Supplier that used the power of suppliers to

e$.$

Used substitute products to