What line is the regular B on in trebble cleff?

the middle one

Explanation:

i think

The treble clef symbol looks like this and signifies medium to high pitches being read on the staff. Each line and space is assigned a specific note, with the lines being E, G, B, D and F and the spaces F, A, C and E on the treble clef staff, starting from the bottom.

Explanation:

Hope this helps, (middle line)