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Controlling Access to Objects Challenge - Can't Pass with Person Accounts Enabled
There seems to be a problem with this challenge if you have Person Accounts enabled in the org that you're using with Trailhead. With Person accounts enabled, Contacts under Org-Wide Defaults are set to "Controlled by Parent" and can't be changed, which therefore means when you create a profile with Read access to the Accounts object, you must also give Read access to the Contacts object. There's no way to specify access to just the Accounts object, which is required to pass this Challenge.
"Once Person Accounts is activated, it cannot be deactivated. Please try to do this challenge in a new Dev Org.
To login into trail head you can use your old org only but for activity(code and config) related changes you can use new org. In such a way all point will add in your old profile only."