From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on the shelf so that the dictionary is always in the middle. Then the number of such arrangements is

Question

( A ) at least 1000
( B ) at least 500 but less than 750
( C ) less than 500
( D ) at least 750 but less than 1000