Stat1: if Total customers= 80, then roses = 80*60% = 48, then Red roses = 48* 50% = 24,
Now, People got Red (24 nos.) and Yellow (24 nos.). now,24 people have 1 choice either buy Yellow(24) or Orange (24) roses. It means, Customers having two types of Roses = 24 nos. < 40. So, less than half of the customers buy two types of roses.
Sufficient.Stat2: if Total customers= 80, then roses = 80*60% = 48, then Red roses = 48* 50% = 24.
Now, People got Red (24 nos.) and given, half of the people who bought red roses bought exactly one other type of rose. It means, half, 12 nos. have Yellow & Red roses. But, the first half of the customers having Red roses can buy 3 types of roses (Red, yellow and Orange) or one type Red roses only. Till now, 24 or 12 customers got 2 types (Red and Yellow) of roses.
Rest, 24 people can get Yellow or Orange or both.
So, customers bought two types of rose = 12 or 12+24=36 or 24 or 24+24= 48, now, we are not Sure, if more or less than half of the customers (40) buy two types of roses.
Insufficient.So, I think A.