Answer:
It is B
Explanation:
I had this question on my test last week
1) occluding junctions
2) anchoring junctions
3) communicating junctions
Occluding junctions do not totally seal the space between cells and the resulting permeability varies greatly. I would say anchoring junctions are most likely with one of the other 2 junctions being least permeable.
By intruding mutations, which are the ultimate source of biological diversity. I think this is it.