For which of these ports is HTTP the correct protocol?

HTTP, which stands for Hypertext Transfer Protocol, is primarily associated with web traffic and is used for transmitting hypertext over the internet. The standard port for HTTP is 80. This means that when a web browser requests a webpage using the HTTP protocol without specifying a port number, it defaults to port 80.

In contrast, port 25 is typically used for Simple Mail Transfer Protocol (SMTP), which is responsible for sending emails. Port 110 is used for Post Office Protocol (POP3), which is a protocol used to retrieve emails from a mail server. Port 443 is associated with HTTPS (HTTP Secure), which is the secure version of HTTP that encrypts data being transmitted for security purposes.

Thus, B is the correct answer because it accurately identifies the default port number used by the HTTP protocol.