don't understand why you will believe this is a correct solution and what is the differece between "will not" and "are not able to"
nisso = em + isso = in this/that
Believe (acreditar) always need a "em" (in) afterwards, so all the "em" forms are needed. If there was a noun after, then it would be "nesse" instead
"Voce nao vai acreditar nesse filme"
If I follow that rules of 'este/esta/isto/deste/desta/neste/nesta =THIS' and Isso/esse/essa/desse/dessa/disso/nesse/nessa I would naturally assume NISSO =That
Which is the given form in the hint too, hence, is this a bug - or am i confused?