The minister tried to assure the people regarding their safety.

The correct answer is: A. convince.

To convince someone is to persuade them to believe or do something. In this case, the minister is trying to persuade the people that they are safe.

The other options are incorrect because:

• To warn someone is to tell them about a possible danger. The minister is not telling the people about a danger, but trying to persuade them that they are safe.
• To provide someone with something is to give it to them. The minister
  Join Our Telegram Channel

  Subscribe on YouTube
  is not giving the people anything, but trying to persuade them that they are safe.
• To protect someone is to keep them safe from harm. The minister is not keeping the people safe from harm, but trying to persuade them that they are safe.