We just made choice A. FIRE was 7-8 years away depending on unforeseen circumstances. The would've put DS at the teenage years. We figured that by then, he may not want us home all the time. We are his heroes now, so one of us should stay home now. (We also have another son and hope to have more.) So, recalculating, it'll only take an additional 5 years (maybe less depending on my success in side gigs).
Plus, we'll be able to homeschool. And thanks to the wonderful system in place here, I will be a SAHD. (Neither of us were too particular about who stayed home.) The reasons were simple. If we have another kid, DW gets paid maternity leave; I got jack squat. If I ever need to go back to work, I teach math and science which gives me easy reentry. Also, because I taught math and science, I have the more lucrative tutoring gigs available both in quantity and value. Bonus for DW, she likes her job more than I did mine. Not that I didn't like my job, but I knew I was just a mercenary trying to do what was best for my family.
FIRE may be an end goal, but it's not the only one. I liked a post from the high risk/high reward investment thread that mentioned "small humans." If kids are a good, albeit risky, investment, and I can potentially make that investment better myself, I see that SAHP route as the best option.