Answer:
C) available to the public before he bought the stock
Step-by-step explanation:
Insider trading is when an agent or someone with privileged information on the future performance of stocks buys stocks based on this information with the aim of making gain.
This is an illegal activity and pepertrators can be charged for insider trading.
In this scenario Nester buys shares because he knew dividends were going to increase, and sells them to make a profit.
He will not be liable for insider trading if the information on dividend increase was available to the public before he bought the stock. Then it will not be confidential information