Intercessory prayer is pointless

[Angrboda]

What you say here is contradictory to your option 4.

How can a person choose to get cancer, when god already knew what would happen before creation?

Since god does the creation, and during creation knew what will happen (because he programmed the human to, or willed it to be that way or whatever theists come up with). How can it be any one else fault but god?

No one chooses to get cancer. Our choice can lead to it. Our environment can lead to it (other people's choices). Our bad genes passed on from our parents can lead to it (more other people's choices).

God's knowledge of what we will freely choose does not limit our ability to choose it.

And God's choices lead to cancer, not just incidentally, but necessarily, otherwise God simply doesn't know. (And Molinism doesn't fix the problem either.)