从A、B、C、D四个选项中，找出其划线部分与所给单词的划线部分读音相同的选项。
roll

A．soldier

B．improve

C．apologise

D．photograph

contain

A．mountain

B．certain

C．grain

D．captain

cigarette

A．citizen

B．necessary

C．because

D．suggest

frighten

A．invent

B．kindergarten

C．open

D．kitchen

bathe

A．author

B．birth

C．northern

D．tooth