Ch$\mathrm{.}2.$ According to the Porter video, which of the following forces exerted by Southwest Airlines influenced the rest of the airlines industry?

Question $7$ Select one:

a$.$

Supplier$($s$)$

b$.$

Buyer$($s$)$

c$.$

Competitor$($s$)$

d$.$

New Entrant$($s$)$

e$.$

Substitute$($s$)$