Answer:
Correct answer is Oregon Treaty and Treaty of Guadalupe Hidalgo .
Step-by-step explanation:
First option is not correct as it refers to the questions of slavery in the newly added territories.
Second option is also not correct as this acts were also covering the questions of slavery.
Also this acts mentioned above were introduced after Polk's death.
Third option is correct as it led to inclusion of new territories in the United States, and their spreading from Atlantic to Pacific Ocean. It included the territory of todays Oregon, California, Arizona, Colorado, Nevada...
Last option is also not correct and is also connected with the question of slavery.