The answer is the last one because infinitive phrases need a to- with a verb to it like to visit. to was used and visit is a verb because you can visit things like the store, For Example: we went outside to visit the store.
I believe if you have five large pizzas and split them in half meaning they would be 2 halves in each box. then they would be 10 people at the party if everybody gets 1/2 of a pizza
Answer: Since a long time they have tracked down no gold in that country
Explanation: