If something is beyond the . . . . . . . . of human knowledge man can know nothing about it.

edge
view
end
boundary

The correct answer is boundary.

A boundary is a line that separates two things. In this case, it is a line that separates what we know from what we do not know. If something is beyond the boundary of human knowledge, then it is something that we cannot know.

The other options are not as accurate.

  • Edge can refer to the outermost part of something, but it can also refer to a point where two things meet. In this case, it is not clear which meaning is intended.
  • View can refer to a scene that is seen, but it can also refer to a way of thinking about something. In this case, it is not clear which meaning is intended.
  • End can refer to the final part of something, but it can also refer to a goal or purpose. In this case, it is not clear which meaning is intended.