Mass density of liquid ( ) is given by

• A. <img src="/_files/images/civil-engineering/hydraulics/143-7.5-1.png">
• B. <img src="/_files/images/civil-engineering/hydraulics/143-7.5-2.png">
• C. <img src="/_files/images/civil-engineering/hydraulics/143-7.5-3.png">
• D. all the above.