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A parallel-plate air capacitor of a plate area $A$ and plate separation d has capacitance $C_0, A$ dielectric of thickness $d$, width $A / 2$ and relative permittivity $k$, is inserted between the plates as shown. The capacitance of the capacitor is

• A
  $2(k+1) C_0$
  
• B
  $(k+1) C_0$
  
• C
  $kC _0$
  
• ✓
  $\frac{k+1}{2} C_0$