Step 1: Concept
Coding based on vowel substitution. In many such codes, vowels (A, E, I, O, U) are replaced by numbers 1-5 respectively.
Step 2: Analysis
- Vowel positions: A=1, E=2, I=3, O=4, U=5.
- SITE: S remains, I $\rightarrow$ 3, T remains, E $\rightarrow$ 2. Result: S3T2.
- COAL: C remains, O $\rightarrow$ 4, A $\rightarrow$ 1, L remains. Result: C41L.
Step 3: Apply to AROUND
- A $\rightarrow$ 1
- R $\rightarrow$ R
- O $\rightarrow$ 4
- U $\rightarrow$ 5
- N $\rightarrow$ N
- D $\rightarrow$ D
Result: 1R45ND.
Final Answer: (2)