The horizontal sections of a steel frame are the
a. shell
c. suspension
b. i-beams
d. rebar

The horizontal sections of a steel frame are the I-beams.

Explanation:

The horizontal sections of a steel frame are the I-beams. Steel frames are used for building construction. They have vertical steel columns and horizontal I-beams. Those elements combined together form a rectilinear grid and they can support roofs, floors, walls, etc. An I-beam is a beam with an I shaped cross section. They are used in construction in steel frames and also in engineering.

answer michelangelo; i believe this is correct, plz check first good luck;