While staying in Scotland alone, _____. [ ]

A. loneliness was always around me

B. many interesting places were visited

C. I was a bit homesick

D. my friends in China encouraged me a lot

类A是类B的友元，类B是类C的友元，则下列说法正确的是( )。

A．类B是类A的友元

B．类C是类A的友元

C．类A是类C的友元

D．以上都不对