Primaries only allow registered members of a political party to vote to select that party's candidates, whereas primaries allow all registered voters to choose which party's primary they will participate in.

closed primaries only allow registered members of a political party to vote to select that party's candidates, whereas open primaries allow all registered voters to choose which party's primary they will participate in.

Explanation.- An open primary is a primary election that does not require voters to be associated with a political party in order to vote for partisan candidates. In a traditional open primary, voters may select one party's ballot and vote for that party's nomination.

the 2nd option is the answer