Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D?

A.
802.1D bridges do not relay BPDUs.

B.
802.1w bridges do not relay BPDUs.

C.
802.1D bridges only relay BPDUs received from the root.

D.
802.1w bridges only relay BPDUs received from the root.

Explanation:
in STP only the root port injects BPDUs to the network ,while in RSTP all the bridges that participates in the tree generates BPDUs.