Paul's favorite _____ is Monday because he has English classes on it. [ ]

A. time

B. month

C. year

D. day

某项工作是由三个同类性质的分项工程合并而成的，各分项工程的工程量Qi和产量定额Si分别是：Q₁=240m³，S₁=30m³／工日；Q₂=360m³，S₂=60m³／工日；Q₃=720m³，S₃=80m³／工日。其综合时间定额为（）工日／m³.

A.0.013

B.0.015

C.0.017

D.0.020