The correct answer is D. terylene.
Terylene is a synthetic fiber made from terephthalic acid and ethylene glycol. It is a strong, durable fiber that is resistant to water and chemicals. It is also a good insulator, making it ideal for use in parachutes.
Rayon is a semi-synthetic fiber made from cellulose. It is a strong, absorbent fiber that is often used in clothing.
Viscose is a semi-synthetic fiber made from wood pulp. It is a soft, absorbent fiber that is often used in clothing.
Cotton is a natural fiber made from the cotton plant. It is a soft, absorbent fiber that is often used in clothing.
Terylene is the best choice for parachutes because it is strong, durable, and resistant to water and chemicals.