The unit cell structure of a mineral perovskite crystallizes in cubic unit cell wherein calcium (filled circles) and oxide (hollow circles) constitute a cubic close packing (ccp) arrangement and titanium ion (hollow square) occupies an interstitial hole as shown below. Charges are omitted for simplicity. The empirical formula of this compound is

A

$$\text{Ca}_2\text{TiO}_3$$

B

$$\text{Ca}_4\text{TiO}_6$$

C

$$\text{CaTiO}_3$$

D

$$\text{Ca}_8\text{TiO}_6$$