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B) There are inherent, near-universal evolutionary advantages in being smarter, and as such, most species with a complex brain are becoming smarter over time. Also curious whether there's any evidence that wolves or giraffes or eagles are smarter today than 10M years ago...
I believe it's mostly A, and as such, intelligence increases happen under environmental change and require co-evolution of brain, body, and social structures. Many evolutionary coincidences were required to create the conditions for the development of human intelligence
Most likely B, imho. We (we all, including cockroaches) live in constant competition with our own and wrt other species to exploit the limited resources of our environment. A few more W/day of consumption required by a new layer of cortex can make a (worthy) difference.
On the other hand, in an universe with unlimited resources (and, why not, without "passions") -such as the virtual environments we build for ML models- intelligence is most likely an useless feature and "beings" can just survive without it.
The really interesting question is that since brain size is constrained by the birth canal (why humans are born with such underdeveloped brains relative to other species) what does it mean for evolution that so many babies are now born via c section.
Quoting Darwin "“It is not the strongest or the most intelligent who will survive but those who can best manage change." Maybe when enviromental changes happen in a short lapse of time, it is favoured the survival of those who can change their behavior rather than their biology
I guess...If 'time' is long term natural selection would 'pick' the brains that work for the changes in the environment, if 'time' is short term the difference may be negligible which may be A 
Species get smarter because the world changes and adapting to it requires new ways of thinking. Humans probably don't though, because everyone survives, and being smarter is correlated with having fewer children; we don't apply standard evolution theory these days.
So then it is possible that we may be getting less intelligent? Whatever intelligence is :) Fun thought to have in the morning...
Imagine each species is a local Maxima. Mammals are all climbing the same mountain range. Apes are all climbing the same mountain. And maybe we just happen to be climbing the tallest mountain around
Where are those studies ?
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