Hello :)
Invaders accessed Bulgaria through the Black Sea.
Hope this helps!
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Your answer is a, b and c
Answer:
Resistance (i.e., war and military resistance); sometimes this included attempts to draw upon supernatural solutions to avoid or to undo conquest.
Acquiescence—often this meant trying to negotiate the best terms possible;
Alliance—sometimes it was possible to join with the Europeans in conquest of neighbours (often traditional enemies with whom they had long been in conflict anyway).
Explanation:
(I gave three)