Discussion
Why is a MOSFET vulnerable to static discharge?
Answer: D
The oxide is only tens of nanometres thick, so a few tens of volts across it punctures it irreversibly, and since the gate draws no current there is nothing to bleed the charge away either. The third option states a contributing fact rather than the mechanism, and the threshold and capacitance are beside the point. A structure that provides perfect isolation also provides no path for accumulated charge, which is the whole handling problem.
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