Cattle drives boomed during the late-1800s because of the%0D%0AResponses%0D%0A%0D%0A%0D%0AA%09invention of barbed wire.invention of barbed wire.%0D%0A%0D%0A%0D%0AB%09invention of the telegraph.invention of the telegraph.%0D%0A%0D%0A%0D%0AC%09end of restrictive labor laws.end of restrictive labor laws.%0D%0A%0D%0A%0D%0AD%09westward expansion of railroads.

D. westward expansion of railroads.