What is the efficiency of diesel cycle if and T denotes the specific heat ratio and temperature respectively?

• A. 1 ( frac{T4-T1}{T3-T2} )
• B. 1 ( frac{T4-T1}{ (T3-T2)} )
• C. 1 ( frac{ (T4-T1)}{T3-T2} )
• D. 1 ( frac{T4-T1}{( -1)(T3-T2)} )