Choices B,C and D are correct
Firstly, we get the expression given in the question as follows;
What is left is to get the expressions equivalent to this
a) This is incorrect
b) This is the same as the expression and this option is correct
c) This is also correct as the answers are same
d) This is also correct as we multiply the two fractions after removing the parentheses
e) This is incorrect as 6/10 in its simplest form is 3/5
f) This is also incorrect as 2 multiplied by the numerator 3 is 6/5