Concept:
Kotilingala, located in present-day Telangana, was an important ancient city and is regarded as the capital of the Asmaka (Assaka) Janapada, one of the sixteen Mahajanapadas.
Step 1: Identify the correct Janapada.
Among the given options,
\[
\boxed{\text{Kotilingala} \rightarrow \text{Asmaka Janapada}}
\]
Step 2: Analyse the options.
• Avanti -- Capital: Ujjain.
• Anga -- Capital: Champa.
• Asmaka -- Capital: Kotilingala. \checkmark
• Magadha -- Capital: Rajagriha (later Pataliputra).
Step 3: Final conclusion.
Hence, the correct answer is
\[
\boxed{\text{Asmaka}.}
\]