Answer is D. Answer cannot be determined
n/4 + r/8 = s/8 + t/6
2n + r = s + 4t/3
Now lets do a Col A - Col B to see whether the result is +ve , -ve or zero
Col A - Col B = 2n + r - 2s + t
Substituting the value of 2n + r we obtained previously we get
Col A - Col B = s + 4t/3 - 2s + t
Col A - Col B = t/3 - s
Now the result will be +ve if t/3 > s i.e. t > 3s so Col A > Col B
And the result will be -ve if t/3 Col A
And the result will be zero if t/3 = s i.e. t = 3s so Col B = Col A
Since the relation between t and s is not given the relationship cannot be determined with certainty.