The correct option is A 1500 mL
∙ The current volume of juice in the juice jar is 1000 mL.
∙ The jar can hold 500 mL more juice which is half of the current volume of juice.
∙ So, 1000 mL + 500 mL = 1500 mL
∙ Therefore, the estimated capacity of the juice jar is 1500 mL.
Hence, option D is correct.