The correct answer is C because the profit for the seller of a European put option is calculated as:

$\text{Profit} = -\text{Max}(0, X - S_T) + P_0$

Where:

• $X$ is the exercise price (1,320),
• $S_T$ is the underlying asset's price at expiration (1,340),
• $P_0$ is the put option price (30).

Substituting the values:

$\text{Profit} = -\text{Max}(0, 1,320 - 1,340) + 30 = -0 + 30 = 30$

Options A and B are incorrect because they represent calculations for a call option or misinterpret the payoff formula for the put option seller.