What are the lower (Q1) and upper quartiles (Q3) for the following scores?

3,5,5,5,6,8,9,10,11,13,13,14,15,17,18,20

A. Q1 = 5 and Q3 = 15
B. Q1 = 5 and Q3 = 14.5
C. Q1 = 5.5 and Q3 = 15
D. Q1 = 5.5 and Q3 = 14.5