Which technology to share computing and storage resources over a network to end users? a. augmented realityb. cloud servicec. personal information managementd virtualization

Cloud, as it's the only one that implies and requires a network.  Though to be fair cloud usually means on 'the internet' and not on a LAN.

Just because a system/computer is virtualized does not mean it's shared.  It could be sandboxed on your local computer and NOT networked (for security reasons).

Personal information management sounds more like a PII term Personally Identity information aka information about you that you don't want out in the public as it could be used to steal your identity (online).

and lastly, definitely not augmented reality as that has nothing to do with "network" and is about how humans interface with technology/computers.

The answer is the B.