Option 1 -> reticent means reluctant to speak or reserved, not related to refusing to change one's stance.
Option 2 -> stubborn means unwilling to change one's mind despite arguments or pressure, which perfectly matches the context.
Option 3 -> hesitant means uncertain or slow in acting, which contradicts "refusing to change his stance."
Option 4 -> indecisive means unable to make firm decisions, which is opposite to maintaining a firm stance.
Hence, Option 2: stubborn -> The word "stubborn" accurately describes someone who remains firm and refuses to alter their position despite external pressure, which aligns perfectly with the CEO's unwavering attitude described in the sentence -> correct