Im sorry? i couldnt quite understand that....
I'd go with A because the other options don't make sense at all.
Someone highly skilled in one particular area
Hope this helped! Good luck! :)
I would suggest working on word choice, since you used the same words many times in the essay.
That is the answer. :)
A subordinate clause is part of a sentence that would <u>not</u> make sense on its own. For example
The cat was tired, <u>as he always ran around the field</u>
The part in bold is the main clause
and the part underlined is the subordinate clause