Robert Kennedy urged civil rights workers to focus on voter registration because he... A) thought voter registration would be easier to achieve...

If you are operating out of a textbook or a set of class
readings or course instruction, I would turn to these first.  Perhaps, there is some
answer that has already been stated from which you can draw.  To be quite honest, I am
not entirely comfortable with the choices offered here, which is why if you have
specific readings or analysis, perhaps the answer would be more evident.  I think that
the selection of the answers featured might reflect bias or historical slant.  For
example, if one believed that Robert Kennedy was passionate about his defense and
advocacy for Civil Rights, letters C and D might not be immediately embraced as they
reflect the use of Civil Rights in a more political context.  However, if one believed
that Kennedy was intent about bringing Civil Rights for people of color into existence,
there might be a more immediate embrace of A or B.  Much is dependent on what is out
there and what you have experienced in your class and
instruction.

For me, I think that Kennedy was fairly
zealous and legitimate about Civil Rights.  I consider his landmark speech given in
1961:

We will not stand by or be aloof. We will
move. I happen to believe that href="../../topic/Brown_v._Board_of_Education">the 1954 Supreme Court school
desegregation decision was right. But my belief does not matter. It is the
law. Some of you may believe the decision was wrong. That does not matter. It is the
law.

When examining these words and his overall
stance towards Civil Rights, his willingness to send federal troops to accompany James
Meredith to classes at the University Mississippi and his staunch support of Dr. King, I
think that Kennedy would have been an advocate for voter registration as the key to
fighting segregation practices.  I also believe that he was pragmatic enough to see the
issue as requiring benchmarks for success and voter registration was a part of this
process.  In my mind, I could live with B as an answer, with A as a close second.  Yet,
I stress that the need to refer back to your classwork becomes critical in this process,
superseding anything written here.