Answer: E.None of these splits are efficient.
Explanation:
From the above question,
1. Gary: green shirt 60, red shirt 20, blue shirt 20
2. Renate: green shirt 30, red shirt 60, blue shirt 10
3. Blake: green shirt 10, red shirt 20, blue shirt 70
From the above split, we can say that each should get the highest no of shirt assigned to them but the total number of shirts was not stated in the question to aid our sharing of the shirts efficiently.