Which of the following cases would be heard first in an U.S. district court?

AA citizen living in Texas sues his neighbor for property damage due to roaming cattle.

BCitizens from Arizona accuse each other of robbery and assault with a deadly weapon.

CA citizen of Mexico residing in Utah accuses a U.S. university of violating her civil rights.

DCitizens from Louisiana being a class-action suit against a company operating their state.