In Texas, state funds may only be spent on items for use in public schools. Spending those funds on music stands, then "donating" them to a private school is against the education code, §31.028(c). Also see the state constitution, Art. 1, sec 7, and Art. 3, Sections 51, and 52.
You can LOAN them to a private school indefinitely, but you're still legally responsible for ownership. Your best bet is to declare them surplus and have the school auction them. If the private school wants them, they'll bid for them.
tl;dr: Option A is the only legal one there.