下列叙述正确的是

A．6.02×10²³叫做阿伏加德罗常数

B．摩尔（mol）是国际单位制中七个基本单位之一

C．H₂SO₄的摩尔质量（M）是98

D．气体摩尔体积（V_m）是指1 mol任何气体所占的体积都约为22.4 L

I lost a book, _____ I can't remember now. [ ]

A. whose title

B. its title

C. the title of it

D. the title of that