Final answer:
The statement that best supports the fact about the experience level of REALTORS is that a significant portion of REALTORS are new to the industry.
Step-by-step explanation:
The statement that best supports the fact that about half of all REALTORS have less than two years' experience is b) A significant portion of REALTORS are new to the industry. this statement directly addresses the fact that many REALTORS have limited experience by stating that a significant portion of REALTORS are new to the industry.
This implies that these new REALTORS have less than two years' experience supporting the fact mentioned in the question.