Answer: A) soft.
Step-by-step explanation:
Nylon is a big covalent molecule as it formed by polymerization of small units called as monomers. It is a synthetic polymer and is prepared in labs.
Nylon polymers are soft, light in weight, have high melting point, have excellent resistance towards abrasion and are very resistant to heat.
Thus Nylon is used in making backpacks as it is soft.