— We must thank you for taking the trouble to cook us a meal.    

— ____.   [ ]

A. With pleasure    

B. It doesn't matter    

C. It was no trouble at all    

D. By all means

储罐超装是危险的，按规定100m³罐允许充装（）吨液氨，液氨50摄氏度的密度为0.563kg/L。

A.53

B.55

C.58

D.60