Answer:
C - Even though
Explanation:
Im assuming its C. Put each of the answers in, see what makes the most sense.
1- AS this hand-embroidered picture was expensive, we bought it. Doesn't make much sense to me.
2- BECAUSE this hand-embroidered picture was expensive, we bought it. Makes a bit more sense, but only if the context of the sentence is that they are collectors of expensive pieces.
3- EVEN THOUGH this hand-embroidered picture was expensive, we bought it. This one makes the most sense to me. They likes the picture, and even though it was expensive, they bought it because they enjoyed it so much.