Final answer:
The Mycenaean citadels are associated with Cyclopean masonry, the Lion Gate with its stone lions, and symbols of regal power, so the answer is all of the above.
Step-by-step explanation:
The Mycenaean citadels on mainland Greece are associated with a variety of architectural and cultural elements that reflect their war-like society and need for protection. These include Cyclopean masonry, a construction method using massive stone blocks thought to be too large for humans to move and thus attributed to the Cyclopes; the Lion Gate, a famous protective gateway with a corbeled arch and the relief of stone lions; and broader symbols of regal power, reflected in the palatial centers, like the megaron, which was a reception area for the king. Taking into account these distinct features, the correct answer to the question is D. all of the above.