The law of the city of Weston regarding contributions to mayoral campaigns is as follows: all contributions to these campaigns in excess of $100 made by nonresidents of Weston who are not former residents of Weston must be registered with the city council. Brimley's mayoral campaign clearly complied with this law since it accepted contributions only from residents and former residents of Weston.

Question: If all the statements above are true, which one of the following statements must be true?
Options:
A. No nonresident of Weston contributed in excess of $100 to Brimley's campaign.
B. Some contributions to Brimley's campaign in excess of $100 were registered with the city council.
C. No contributions to Brimley's campaign needed to be registered with the city council.
D. All contributions to Brimley's campaign that were registered with the city council were in excess of $100.
E. Brimley's campaign did not register any contributions with the city council.
Answer: "C"