This question is best solved by matching the final confrontation scene against what each option actually claims, since the caselet gives us one very specific, very physical event to judge Mr. Thakur by.
Since the option describing a trait he showed cannot double as the trait he lacks, and the other two distractors describe qualities the caselet does not actually connect to this scene, the option about missing emotional stability under pressure is the one that directly explains his loss of control.
Let's summarize:
So Mr. Thakur most lacks emotional stability under pressure.