Answer:
D. automobiles, aircraft
Explanation:
Titanium can be used for the production of alloys with iron, aluminum and other elements to increase the mechanical strength used in the aerospace industry (engines, missiles and rockets). It is also used for the production of catalysts in the chemical and petrochemical industry, automobile, agricultural, medical (for the production of orthopedic implants, prostheses and dental instruments), in sports products, jewelry, cell phones, among others.
