2siapec
Except for the "New" item, all other items in the right click menu for drives are provided by Windows, so when there is no Eject item for USB-drives, is it because Windows doesn't provide such an option.
Try and right click on that USB drive in Windows Explorer - no Eject option there either...
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USB harddisks normally don't have an eject button because they have a partition table (unlike most USB sticks, which are formatted as a "floppy drive").
Disks with partition table can have more than one drive letter, so Windows doesn't offer to eject just one drive letter (even if the drive only has one).
You need to eject it by left clicking on the drive icon in the system tray. If you look closely, you can see that you can only eject the device as a whole, not the drive letter.