Step 1: Start from the entry point of digestion: Mouth (vi). Food then passes sequentially through connected organs.
Step 2: Follow the exact anatomical path:
Mouth (vi) $\rightarrow$ Oesophagus (iv) $\rightarrow$ Stomach (i) $\rightarrow$ Small intestines (v) $\rightarrow$ Large intestines (ii) $\rightarrow$ Anus (iii).
Step 3: Writing in order: (vi), (iv), (i), (v), (ii), (iii), which matches option (C).