The total moment at landing would be the total moment at take-off less the moment of fuel used. The fuel used depends on what is meant by trip fuel, is it T/O to touchdown or engine start to engine stop?
If the former, the trip fuel is 52 USG or 52 x 6 = 312lb. The balance arm is 93.6 so the moment change is 312 x 93.6 = 29203, the new moment is 432226 - 29203 = 403022.
If the latter, the trip fuel is 55 USG or 55 x 6 = 330lb, the moment change is 30888 and the new moment is 432226 - 30888 = 401338. This is the only answer that matches so this must be what they mean.