Answer:
the Utah, the Nevada, and the California
Explanation:
Looking at the key, we see that the ships marked "sunk" are red "boats" with red "sparks" around it.
Now, take a look at the map and locate any such boats. There are actually a lot of these: Utah, Nevada, California, etc.
Thus, three American ships that were sunk during Pearl Harbor are: the Utah, the Nevada, and the California.
