We need to list the missing properties a,b, and c
a) we multiplied 1/2 by (5/3 * 5/4 )
so, it is distribution property over multiplication
b) we have arranged the fractions ( 5/8 * 5/6 )
So, the property is Commutative of multiplications
c) Associative property
Because (5/8 * 5/6 ) * 6/5 = 5/8 * ( 5/6 * 6/5 )