This question checks what regional cultures show up in Bhaona, a traditional Assamese theatre form.
Assam and Orissa: partly right, Bhaona does carry glimpses of Assam and also draws on influences shared with Orissa's devotional traditions, but this is not the full picture.
Bengal: partly right, Bengal's Vaishnavite culture also shows up in Bhaona, but again this alone is not the complete answer.
Mathura and Brindavan: partly right, since Bhaona is rooted in Krishna bhakti themes tied to Mathura and Brindavan, but this too is only one part of the picture.
All of the above: correct. Bhaona, created by the saint Srimanta Sankardeva, blends cultural elements from Assam, Orissa, Bengal and the Mathura-Brindavan region into one devotional theatre form.
Since each region named plays a real part in Bhaona, option D, all of the above, is correct.