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It could be due to the fallen state. That ability to synthesize vitamin C may have been lost. There is evidence that animals are degrading due to negative mutations as well. It's possible the same negative mutation occurred in Chimps as well as Humans. Guinea Pigs have also lost that ability. God could have other reasons as well, but I don't know what those might be. Under evolutionary theory, you would thing that the ability to synthesize vitamin C would have been selected over not being able to. But that's not what we see. We see the loss of functionality.

This is known as the "creationist clutching at straws" argument. It relies on ignorance of the true nature of the evidence and false assumptions about the nature of evolution. There are many, many ways in which man and our close ape cousins could have lost vitamin C synthesis functionality; the relevant point is that we and our close cousins have lost it in the same way through an identical shared mutation.. Other unrelated creatures that have lost this functionality have lost it for different reasons. It is absolutely inconceivable that separate ancestors (that just happen to be our closest DNA and morphological cousins) could have both experienced and then propagated the identical deletrious mutation so we are left with the conclusion that either we have a shared common ancestor or God faked the evidence to make it look as if we have a shared common ancestor in order to fool scientists into going to hell.

The problem with "God moves in mysterious ways" which often gets wheeled out when crushing evidence of common descent and/or an ancient universe is demonstrated is that if we cannot understand God's motivations in such issues then why should we trust the bible or God's promises of eternal bliss etc? Worshipping an unpredictable God with unfathomable motivations is very strange behavior. Much more sensible to just accept that an account of the creation that God supplied to bronze-age people and which made sense to them may not apply to us, with our greater empirical knowledge of the universe.