Mark decomposed the fraction five-sixths into three fractions. None of the fractions had a denominator of six. What fractions could Mark have used?
a) 1/3, 1/3, 1/3
b) 1/2, 1/3, 1/6
c) 1/4, 1/4, 1/4
d) 1/2, 1/4, 1/8