The main reason why we cannot drill a hole to the Core is

See the explanation

Explanation:

At the inner core, you'd have to drill through solid iron. This would be especially difficult because there's near-zero gravity at the core and there it is super heat ness leverl that no-human can survive the heat of that core and many research are still under-work.

none of the above because millions of people die in a year(also depends on where you live)

explanation: