First, you are correct. These are all subjects and must therefore be in the nominative case, so D is wrong. Next, we almost never start multiple subjects with "I" (except in a pejorative sense, I've just learned), so C is out. Now, I would actually prefer, like Peachey above, to say "she, you and I," (A), but I found the following on page 63 at
http://www.distanceeducationju.in/pdf/B.A.%20Part%201%20Eng.%20B%202008-09-New%20Setup.pdf :
"When there are pronouns of different persons, second person [you] should come first, third person [she/he/they] next and first person [I/we] last, unless used in pejorative sense, when the order is reversed."
This was the only reference I could find, and I have never heard (or probably used) that rule in my life, but at least it does appear to come from somewhere, so the answer to your question would be (apparently) B.
As for that part about the "pejorative sense," I understand it to mean a sentence formed with a negative intent. So if I said, "We are terrible at speaking Spanish" but wanted to use individual pronouns, according to this rule, I should say, "I, she and you are terrible at speaking Spanish" as opposed to "You, she and I are wonderful at speaking Spanish."