In Sentence I, the word "impose" is incorrectly used. "Impose" means to force something (such as a rule, tax, or opinion) on others. It does not fit the context of revealing or exposing bricks. The correct word here would be "expose" or "reveal," not "impose."
In Sentence II, the word "imposed" is correctly used. It refers to the enforcement or application of a rule or restriction by authority, which aligns perfectly with the meaning of "impose."
In Sentence III, the word "imposed" is again used incorrectly. One cannot "impose" people. The correct phrasing would likely be something like "healthcare workers had been exposed to the virus."
Therefore, the correct usage appears only in Sentence II.
Hence, option (a) is the answer.
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