Daily SAT Question 7/6

Answer to previous one from 7/3 was B.

To keep high-performance drones stable in gusty winds, engineers rely on control algorithms that adjust rotor speeds hundreds of times per second. While the same philosophy appears in the drones' physical construction, their carbon-fiber arms ______ from a single piece to minimize weak joints.

Which choice completes the text so that it conforms to the conventions of Standard English?

are molded

had been molded

molded

were molded

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Daily SAT Question 7/6