Biology

The correct answer is: A.White blood cells bumping into each other sharing antigen info.

This is an example of direct cell communication, specifically through a process called cell-cell recognition. In this case, white blood cells (such as T-cells) physically interact with each other, exchanging information about antigens through surface proteins. This direct interaction does not involve a signaling molecule being released into the extracellular space; instead, the cells communicate through direct contact.

Here’s what the other optio...