A potometer with a leafy shoot weighed 18.9g initially and weighed 17.9g after one hour. From this it follow that

• A.the shoot absorbed 1g of water per hour
• B.1g of water per hour evaporates from the potometer
• C.the shoot lost 1g of water per hour
• D.the potometer water receded at the rate of 1g per hour
• E.the shoot was respiring and lost weight at rate of 1g per hour