I was practising some mass and balance questions and I found that my answer is a little bit too far from the listed answers. Can anyone help me to see if I did something wrong?

The question was:

Given that the Dry Operating Mass (DOM) is 27 372 kg, there are 12 000 kg of trip fuel and 4 000 kg of fuel are expected on landing, what is the maximum allowable traffic load for the Medium-Range Jet Transport (MRJT) aeroplane?

1)23 923

2)23 528

3)19 005

4)19 428

My solution was:

Operating mass = DOM + Usable fuel

$27 372 - (12 000 - 4 000) = 19 372 kg$

That doesn't match any of the options, so what is the correct answer?