You probably would have known the answer to this if you were a computer engineer or from an IT background. For those majority who don't know why the default drive is always the letter C and not A or B, keep reading this post.
If you still don't know what we're talking about, go to 'My Computer' on your desktop or laptop and check out your storage drives. The first one will obviously be 'C' and followed by others if you have introduced divisions in your main drive.
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Initially, the computer didn't come with a lot of storage space. The regular computers right now have a space of 500 gigabytes or 1 terabyte, but earlier on it was barely a few kilobytes.
Just like how an external hard drive works for us, a floppy disk would help to store files which couldn't be stored in the computer due to lack of space.
One could add both the floppies as a drive in the computer. Hence, the drives were named 'A' and 'B.'
The computers started coming with a built-in hard drive so that more files could be stored.
But the letters of the hard drives within the computer remained same.
You should be having administrative rights and a good knowledge of the workings of your computer in order to set the correct letters to your hard drives.