$\text{Michael } \quad \underset{10\;kms}{----} \quad I$
$\text{Ahmed }\quad \underset{5\;kms}{----} \quad I$
$\text{Susan } \quad \underset{7\;kms}{----} \quad I$
$\text{Susan } \quad {----}\quad \text{Arun}\quad {----}\quad \text{Ahmed}\quad {----}\quad I$
So, the distance between Arun and I is between $5\; kms$ and $7\;kms.$
Answer C. $6.02$