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Not convinced with B OPTION. I choose D option , need expert guidance
Here's what the passage says:
Most workers do not have every item they produce judged for qualityNow, here's (D).
(D) Only freelance writers have every item they produce evaluated for quality.Notice that "most workers do not," does not mean "only freelance writers do."
After all, "most workers do not," does not mean "all workers other than freelance writers do not." "Most workers do not" allows it to be the case that multiple types of workers do.
For example, "most workers do not," could mean "workers other than, freelance writers and ten other types of workers do not." In that case, freelance writers would not be the only ones that have every item they produce evaluated for quality. Ten other types of workers would also.
So, (D) is not supported.
Now, let's consider (B).
(B) By having every piece of their work evaluated, some workers are caused to produce high quality work.The passage says, "each piece a freelance writer authors is evaluated. That is why freelance writers produce such high quality work."
We see that the passage indicates that having every piece of their work evaluated causes freelance writers to produce high quality work.
Freelance writers are "some workers."
Thus, the passage indeed indicates that, "By having every piece of their work evaluated, some workers are caused to produce high quality work."
So, (B) works.