The correct answer is A) Barbed wire.
Barbed wire was NOT part of the agricultural revolution at the end of the 19th Century.
When we refer to barbed wired, we are talking about the moment ranch owners tried to fence their properties to stop cattle ranching from other ranchers. The idea and the patent belonged to Joseph F. Glidden in 1874. The new invention impeded cattle to break the wired limits. However, this invention was not part of the Agriculture Revolution in Great Britain.
