A leaf primordium is initiated as a small mound of tissue on the flank of a dome-shaped shoot apical meristem.The earliest physical evidence of the site of a newly forming leaf primordium would be

A)development of chloroplasts in a surface cell of the shoot apical meristem.
B)cell division in the shoot apical meristem with the newly forming walls perpendicular to the surface of the meristem.
C)preprophase bands parallel to the surface of the meristem in subsurface cells of the shoot apical meristem.
D)elongation of epidermal cells perpendicular to the surface of the shoot apical meristem.
E)formation of stomata in the epidermal layer of the shoot apical meristem.