Rafael,
In a contract for option, the optionee does not get an option upfront, but instead buys the option over time. The contract states that the optionee will get the option after a fixed number of payments has been made.
There is usually a lease involved so the optionee also has right of possession.
As I understand it, this arrangement avoids transferring equitable title to the tenant (who usually has a small amount invested) so there is no need to foreclose, but evict in case of nonpayment of rent (some jurisdictions require foreclosure for L/O).
Take a look at Jack Shea & Mark Warda’s book “Secrets of Lease Option Profits” or see Jack Miller’s book from his option seminar for more details.
Pedro Machado