The density of seawater is 1.025 g/ml. what is the mass of 1000 liters of seawater in g amd kg?

You are given the density of seawater which is 1.025 grams per milliliters and its volume at 1000 liters. You are required to find the mass of the seawater in grams and kilograms. You need to know that density is equal to mass over volume. Let us denote D as our density, V our volume and M as our mass. So,  

D = M/V
M = D*V
M = (1.025 g/mL)(1000 L)(1000mL/1L)
M = 1,025,000 g
To change into kilograms, simply divide it by 1000
M = (1,025,000 g)(1kg/1000g) = 1,025kg

Ithink it is a. but i'm not 100 percent sure.

Assuming you're referring to significant figures, none of these answer choices are shown to be zero as significant digits. did you, by chance, forget to add something?