Try them out!
well ill help on a few of them, but you need to know how to add fractions, and it seems you don't know, here is a lesson,
to add a fraction, you need the bottom number, or the denominator, for example 1/2, 2 is denominator, to be the same,
so if it is 1/2+2/4, we can multiply 1/2 by 2 on the denominator and numerator(the number on the top) and get 2/4,
2/4+2/4=4/4, = 0. Remember that multiplying the numerator and denominator by the same number is multiplying by 1,
so 1/2*2/2=1/2*1
Let's try out (A), (b), (C)
for (A)
I am assuming 2 6, is 2/6, so 2/6+8/18=2/6*3/3+8/18, that is 6/18+8/18=14/18 we can divide by 2/2, and that is 7/9
now a smarter way to do this is to subtract 10/12 and 2/6, this is 10/12-4/12=6/12=1/2
now any answer that is "1/2" works
that means
(B)(C) are the only ones that work
