Q: In this task, you are given a text which is the body of a document. You are given a question and options. Pick the correct number. Don't generate anything else apart from the numbers provided in options.
Context: The MU (multiple-unit) commuter cars of New Jersey's Erie Lackawanna commuter lines were a type of multiple unit commuter railcar developed for the Delaware Lackawanna and Western Railroad (DL&W). Most of the construction for the overhead catenary (wire) system was done in 1929 and 1930.
Question: The document can be classified to which topic?
Options: 1)Plant, 2)NaturalPlace, 3)Village, 4)MeanOfTransportation
A:
4