Guessing at what word the question is asking about here. I'd say B - obstinacy means being stubborn or inflexible, which doesn't apply here.
I like bacon because of its intense flavor. It crunches noisily when I eat it and it tastes like heaven. Bacon is a super food that should be praised by everyone. GO BACON!
It's based on a boy the author saw during her day out with her child
Bring humans into the era that Kurzweil is most closely associated with the singularity