The answer to the first analogy (mystery:clue :: eraser:) would be letter d. open. Mystery is to clue while eraser is to open. The answer to the second analogy (habit: custom :: extravagant: ) would be letter c. lavish.
A, curious is the answer. Hope this helps.
Answer: becuase Juan's grandmother is proud of Juan, and always thought he would succeed.
Explanation: hope i helped c:
The root word for unmistakable is mistake