I want to know how we rules out this is not a permutation ,nothing is mentioned about order so it can be permuation or combination?

GRE GRE Quant Problem Solving
1

https://www.gregmat.com/quizzes/quiz/gre-quant-flashcards-group-15-quiz (Question 8)

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2

What I thought was there is nothing mentioned about order , so it can be either permutation or combination , but solution treats it as combination problems

I want to know what I’m missing ?

3

The question asks us to choose the items, not arrange them. Since the order of selection doesn’t matter, we’re dealing with combinations. Refer to Permutations or Combinations? - PrepSwift for more.