sbhatnagar wrote:
Why isn't it D, but A?
D. ash anduse them yearly , recovering 50,000 tons of scrap metal, whichare made into
"use them yearly" conveys that the techniques are used once a year or every year. That meaning is a distortion of what the sentence is meant to convey, which is that every year 50,000 tons are recovered via the continuous application of the techniques.
Also, "are" agrees with tons. The point is that the metal is made into products, rather than the tons.
In A, "annually"
...
