The gamma and vega of a delta-neutral portfolio are 75 per $ and 15 per %, respectively. What will happen to the value of the portfolio when there is a shock to the market causing the underlying asset price to decrease by $4 and its volatility to increase by 5%?

A. The value of the portfolio will decrease by $600.75.

B. The value of the portfolio will decrease by $675.

C. The value of the portfolio will increase by $600.75.

D. The value of the portfolio will increase by $675.