Personally, number 3 because it sounds like it should have an exclamation mark.
1. to is the preposition
2. from is the preposition
3. across is the preposition
"Many animals die prematurely in zoos because they are exposed to infectious diseases." is the only quote that has anything to do with the claim, "Zoos must improve conditions so that they can meet the health and safety needs of the animals." because it is the only one that has to do with the early of the animals.
