The first order approximation of the VaR of an option position is nothing but the VaR of the underlying multiplied by the option's delta. This is intuitive because the delta is the sensitivity of the option price to changes in the prices of the underlying, and in this case since the delta is 0.3 and the underlying's VaR is $100, the VaR of the options position is 0.3 x $100 = $30. Therefore Choice 'c' is the correct answer.
(Note that the second order approximation of the VaR of an options position considers the option gamma too, and VaR reduces if gamma increases.)
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