The rule about "Spending Culture" on pg 17 is a sub-heading under City Action B) "Devote to the Arts", but it says that a player can use it "At any point during their City Management Phase...".
Is it a requirement that you must select Action (B) in order to spend your culture to advance on the Culture track?
Or, may you take City Action (A) or © and ALSO spend any culture accumulated via other means to advance on the Culture track?
Thank you.