Which of the following most effectively condenses the underlined sentence by using

Which of the following most effectively condenses the underlined sentence by using deletion and substitution?

a.
after all, how could one prove one had flown an airline without one of those bags filled with mustard yellow socks, black eye-strain masks, little plastic containers of orange marmalade, plastic spoons and knives, little mint candies?
b.
a bag of airline goodies is necessary to prove that one flew an airline.
c.
one needs sock