I think the answer to this should be A.
The statement that is true
regarding restrictive adjectival clause is it will follow a general noun and is
not set off by commas. Restrictive adjective clause limits the meaning the noun
it modifies. Unlike Nonrestrictive Adjective Clause, the Restrictive clause
should not be set off by commas.
The best answer to the question that is being stated above would be the third sentence. The meaning of 'take up' in the excerpt would be best described with the definition of 'to occupy time, space, or the attention of someone'. The mayor is asking to pay attention to grammar -which led him to be cautious of it.
I'm not sure, but I think the answer might be (A)...
There are several. How many are you looking for?