Step 1: Hybridization of Te in TeCl₆.
The central atom in TeCl₆ undergoes sp³d hybridization due to the presence of five bonds (four chlorine atoms and one lone pair).
Step 2: Conclusion.
Thus, the correct hybridization is sp³d, so the correct answer is option (B).
Final Answer:
\[
\boxed{\text{(B) sp³d}}
\]