Which variables will you keep the same

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Explanation:

It is the control variable, also known as the constant variable. As the name suggests, it is the variable that the scientist wants to remain the same. Often, there is more than one control or constant variable in a scientific experiment.

answer: i chose a.

explanation:

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.