Quick revision of the basics;
QNH - the pressure you set on your altimeter subscale that will result in the altitude being displayed as feet above mean sea level.
QFE - the pressure you set on your altimeter subscale that will result in the height being displayed as feet above aerodrome datum.
In a standard atmosphere the pressure decreases by 1mb (or 1HPa) for an increase in height of approximately 30 feet.
Thus at an airfield with an elevation of 330 feet above sea level the QFE will be 11mb lower than the QNH.
To answer your question - your airfield elevation is -31 feet, therefore the QFE will be 1mb higher than the QNH of 1029mb - ie 1030mb, answer B.
HTH