What Type of Orbitals Overlap to Provide Stability to the Tert-Butyl

What type of orbitals overlap to provide stability to the tert-butyl radical by hyperconjugation?

A) 3 ^$\circ$ C 2p atomic orbital + 3 ^$\circ$ C sp² atomic orbital
B) 3 ^$\circ$ C 2p atomic orbital + methyl C-H $\sigma$ molecular orbital
C) 3 ^$\circ$ C sp² atomic orbital + methyl C-H $\sigma$ molecular orbital
D) 3 ^$\circ$ C 2p atomic orbital + methyl C 2s atomic orbital