Step 1: Somatotype mapping.
Sheldon: endomorph–mesomorph–ectomorph. Kretschmer: pyknic–athletic–asthenic.
Mesomorph (muscular, energetic, assertive) aligns with athletic.
Step 2: Eliminate others.
Pyknic \(\approx\) endomorph; asthenic \(\approx\) ectomorph.
Step 3: Conclude.
\[
\boxed{\text{Athletic type (Option C).}}
\]