Read the body paragraph from an essay. "Lords who owned land in Japan certainly had armies. These professional soldiers fought when they were called on. There were also farmers whom lords could call on for help when needed.”

Which revision improves the flow of the paragraph?

“Lords who owned land in Japan certainly had armies. These professional soldiers fought when they were called on. However, lords also had farmers whom they could call on for help when needed.”
“However, lords who owned land in Japan certainly had armies. These professional soldiers fought when they were called on. Lords also had farmers whom they could call on for help when needed.”
“Lords who owned land in Japan certainly had armies. However, these professional soldiers fought when they were called on. Lords also had farmers whom they could call on for help when needed.”
“Lords who owned land in Japan certainly had armies. These professional soldiers, however, fought when they were called on. Lords also had farmers whom they could call on for help when needed.”