A. English "d"
The pronunciation would be something like this: eladoe. Depending on your preference, you could use a very subtle "h" sound at the beginning.
The answer is C. The question translates to "How many books are there?"
So for the usted form, you use the 3rd person singular of the present subjunctive instead of the 2nd person singular present indivatice so, 'hable'
Bailar means "dance" in english.
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Yes that is correct, good job