Answer:
chose to leave out
Step-by-step explanation:
to "choose not to incorporate" also means "chose to leave out". In this context, we can see that the sentence says "these because he remembered that Grandma did not like walnuts". Because Grandma didn't like walnuts, Caleb didn't want to add these into the bread.
We can look at this in another way:
The word "incorporate" means to take in, or contain, or include.
So, to not incorporate means to not include, or leave out.
Hence, making "chose to leave out" the correct option.
Hope this helps! :)