Answer: a. Partnership
Explanation:
Partnership could be defined as a process where two or more group of persons join their resources together to form a business or an investment, if it's a business, it is ran by both of them and the profit and loss realised is been shared amongst them. During partnership, the ratio of capital invested determines the ratio of profit that would be realised by the different persons. Harold and Zack combining resources to own a real estate investment is known as capital despite not signing legally for it yet.