Why is carbon said to provide a “backbone” in many molecules?(1 point)

Question

Carbon atoms have full shells of electrons, allowing electrical signals to pass through them easily.
Carbon atoms have full shells of electrons, allowing electrical signals to pass through them easily.

Carbon atoms have half-full shells of electrons, allowing electrical signals to pass through them easily.
Carbon atoms have half-full shells of electrons, allowing electrical signals to pass through them easily.

Carbon atoms can form chains and branches with each other, and other atoms can attach to these.
Carbon atoms can form chains and branches with each other, and other atoms can attach to these.

Carbon atoms have long narrow shapes, allowing many other atoms to attach to them.
Carbon atoms have long narrow shapes, allowing many other atoms to attach to them.

Answer 1

I wish you would fix the double entry mess. It's annoying. Your best answer here is c.
Carbon has the ability to concatenate; i.e., to form chains with itself and that's the "backbone" of a molecule.

Answer 2

....