Probably B, 3 kilograms. Since grams are too small, and liters isn’t measuring mass, kilograms is the best choice.
You could make 15 lines and cross out 7 and see what you end up with or make a rectangle and make 14 lines so there are 15 lines/boxes then shade 7 and see how many are not shaded...... the answer is 8
-2(x-4) is the answer to your question
I think the answer probably be A