help....GWD-2-22

Q22:

On account of a law passed in 1993, making it a crime punishable by imprisonment that a United States citizen hold gold in the form of bullion or coins, immigrants found that on arrival in the United States they had to surrender all of the gold they had brought with them.

1. On account of a law passed in 1993, making it a crime punishable by imprisonment that a United States citizen hold
2. With a law passed in 1933 that makes it a crime punishable by imprisonment that a United States citizen hold
3. A law passed in 1933 that made it a crime punishable by imprisonment for a United States citizen holding
4. Because of a law passed in 1933 making it a crime punishable by imprisonment for a United States citizen to hold
5. Due to a law being passed in 1933 that makes it a crime punishable by imprisonment for a United States citizen to hold

D.不清楚这里 it 指代什么,如果是law的话那么making the law a crime意思不对, 也不理解make it sth. to do