Natural selection will always select for a bigger brain over other possible solutions if a larger brain is possible.

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Natural selection selects for traits that increase an organism's fitness, or ability to survive and reproduce. While a bigger brain may be advantageous in some situations, it may not always be the best solution to increase fitness. For example, in some environments, physical adaptations such as stronger muscles or better camouflage may be more beneficial. Additionally, a bigger brain requires more energy and resources to maintain, so if there is a trade-off between brain size and other traits, natural selection may not always favor a bigger brain.

Natural Selection Will Always Select for a Bigger Brain Over