Question

I've had a lot of trouble with this module in Government and I would really appreciate the help!
Registering to vote as a member of the Democratic Party...
a) permits you to vote in a Republican primary election in a closed primary state
b) prohibits you from voting in a Republican primary election in an open primary state
c) prohibits you from voting in a Republican primary election in a closed primary state
d) permits you to vote in all primary elections in a closed primary state