The inlet valve of a four stroke cycle internal combustion engine remains open for$

• A. 130¬¨¬®‚Äö√†¬¥
• B. 180¬¨¬®‚Äö√†¬¥
• C. 230¬¨¬®‚Äö√†¬¥
• D. 270¬¨¬®‚Äö√†¬¥