People worry that computers will get too smart and take over the world, but the real problem is that:

a$.$ They're too fast in performing human jobs and companies can't keep up with the speed

b$.$ They're too stupid and already influence many aspects of our day$-$to$-$day life

c$.$ They're too expensive to produce which is why they will never take over the world

d$.$ They're only smart in the sense of abstracting and reasoning, but not learning