I don’t know much about TA but I’d say: c) Horoscope for bros.

How does it account for irrational, unpredictable human emotions & behavior?

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Not my opinion, but the usual answer is "large numbers".

Meaning that you can't predict the behavior of one single individual, but you can predict the aggregate behavior of millions of them, reflected in the historical market movement - the "graphs". This is based on the statistical concept that a larger sample gets you closer to the real average.