Explanation

All listed pairs contained at least one nation that qualified for the 2018 FIFA World Cup. Option A is correct because both Saudi Arabia and Egypt participated in the tournament. Option B is incorrect because while Morocco did qualify, Tunisia did not participate in the 2018 World Cup. Option C is incorrect because while Iran did qualify, Senegal did not participate in the 2018 World Cup. Since all options list states that qualified or are part of a group where at least one state qualified, 'All of the above' is the intended answer.