A & B are correct.
"The root bridge for each spanning-tree protocol instance is determined by the bridge ID. The bridge ID consists of a configurable bridge priority and the MAC address of the bridge. The bridge with the lowest bridge ID is elected as the root bridge. If the bridge priorities are equal or if the bridge priority is not configured, the bridge with the lowest MAC address is elected the root bridge."
https://www.juniper.net/documentation/us/en/software/junos/stp-l2/topics/topic-map/spanning-tree-root-protection.html#id-understanding-bridge-priority-for-election-of-root-bridge-and-designated-bridge
Should be C and D. Bridge priority is to determine which bridge becomes the designated bridge.
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