Which innovation had the greatest impact on the availability of fresh beef on the us east coast by the end of the 19th century? a) barbed wire b) the telegraph c) the steel plow d) the refrigerated box car

The correct answer is D, "the refrigerated box car." This invention allowed beef to be transported long distances without spoiling.

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.