ans is A
From the question we have the eqn
A+B>C+D ........ 1
A+C=B+D ........ 2
A=(B+D)/2 ....... 3
From 2 and 3
C=(B+D)/2=A ,i.e A=C So option (d) is correct
Putting A=C in 1, B>D So option (b) is correct
Since B>D, So We can rewrite 3 as A<(B+B)/2 means A<B, which is against option (a) so option (a) is incorrect
Since A<B , i.e, Using A= C, C< B So option (c) is correct.