In a four stroke cycle diesel engine, the inlet valve

• A. opens at 20¬¨¬®‚Äö√†¬¥ before top dead center and closes at 40¬¨¬®‚Äö√†¬¥ after bottom dead center
• B. opens at 20¬¨¬®‚Äö√†¬¥ after top dead center and closes at 20¬¨¬®‚Äö√†¬¥ before bottom dead center
• C. opens at top dead center and closes at bottom dead center
• D. may open or close anywhere