Able, a Resident of New York, Has a Dispute with Baker

Able, a resident of New York, has a dispute with Baker, a resident of Illinois, involving a contract signed and performed in New York. His damages amount to $50,000, and he wants to sue. The case can be brought:

A) in the New York state courts.
B) in the New York federal court.
C) only in the Illinois state courts.
D) in either the New York state courts or the New York federal court.