Which log file should the administrator check first to determine why the virtual machine will not start?

A is correct

/var/log/vmkernel.log: Core VMkernel logs, including device discovery, storage and networking device and driver events, and virtual machine startup.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004201

vmkernel.log – device discover, storage and networking device, drives, VM startup
Messages – not sure which kind of messages, I guess pup-up window
vpxa.log – vCenter Server vpxa agent logs
fdm.log – vSphere High Availability logs

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ESXi Log Files

* /var/log/auth.log: ESXi Shell authentication success and failure attempts./var/log/dhclient.log: DHCP client log.
* /var/log/esxupdate.log: ESXi patch and update installation logs.
* /var/log/hostd.log: Host management service logs, including virtual machine and host Task and Events, communication with the vSphere Client and vCenter Server vpxa agent, and SDK connections.
* /var/log/shell.log: ESXi Shell usage logs, including enable/disable and every command entered.
* /var/log/boot.gz: A compressed file that contains boot log information and can be read using zcat /var/log/boot.gz|more.
* /var/log/syslog.log: Management service initialization, watchdogs, scheduled tasks and DCUI use.
* /var/log/usb.log: USB device arbitration events, such as discovery and pass-through to virtual machines.
* /var/log/vob.log: VMkernel Observation events, similar to vob.component.event.
* /var/log/vmkernel.log: Core VMkernel logs, including device discovery, storage and networking device and driver events, and virtual machine startup.
* /var/log/vmkwarning.log: A summary of Warning and Alert log messages excerpted from the VMkernel logs.
* /var/log/vmksummary.log: A summary of ESXi host startup and shutdown, and an hourly heartbeat with uptime, number of virtual machines running, and service resource consumption.