How to properly voltage divide an AC/differential signals
A is good because it uses the smallest number of parts. A is bad because the upper output is higher impedance than the lower one. B fixes the bad problem with A, but now you need to match the series resistors precisely to maintain accuracy.
C treats the input as two single ended signals. You will need precision resistors again, and you need to match two pairs. If there is any imbalance in the input ( not perfect differential input), C will attenuate the common mode the same as the differential mode. In contrast. A and B do not attenuate the common mode at all. Thus, the common mode rejection is a factor of two worse in A and B.
There is no right answer. I would probably use B.
Note that 300k resistors are most likely way too big, adding noise and probably offsets to the error budget. You should probably use smaller values.