Why Might Parties Most Likely Prefer a Closed Primary System

Why might parties most likely prefer a closed primary system as opposed to an open primary system?

A) They prevent those who are not serious about voting from choosing a candidate.
B) They ensure that delegates reflect the will and interests of party members.
C) They are more inclusive to voters with all political views and beliefs.
D) They keep non-registered voters from having a say in the political process.