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Adjusting open, highs and lows for past monthly stock prices?

I'm looking into modelling monthly stock prices and want to start off by using data from Yahoo Finance. I know that the closing prices given there are adjusted for stock splits and dividends, but ...
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Adjusted option prices?

I am trying to calculate IV of options for a ticker over the last 10 years. Problem is that some option prices don't make sense (for example, closing price \$31.94, but 30-day call option with 18 days ...