試題詳解

51 Nigel Nelson, a 33-year-old naturalized American citizen, married with two sons living in Manhattan, New York, was arrested because he was found setting up a car bomb near bustling Time Square with an attempt to kill dozens of his fellow countrymen. The capture of Mr. Nelson has indicated the emergence of                , one that worries the police.
(A) drug trafficking
(B) armed robbery
(C) domestic violence
(D) home-grown terrorism