I'd go with b) growing out natural color!
(a) would not solve the tone mismatch problem, it will only entrench the situation; and c) would really damage the hair.)
Since I have no experience with henna, I can't really be of much help as to how to tone down henna best with deposit-only dyes, but I'll be happy to answer any questions about the general growing out process, if you have any. Yes, it's challenging, but oh so worth it!
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