See, that's what confuses me though. I understand that -zuri means good and that mtu mzuri means good person, but in the multiple choice version of this, mtu mzuri is also labeled as a correct answer in translating good.
EDIT: Correction, it's mtu mwema that's labeled as a correct translation of good, at least in the version of this problem that I've encountered.
The makers of this course must have made a mistake here. I think it was announced at the start of this course that this is a beta version or something, in other words, that it is still in development. Maybe that is also the reason why we do not have a speaker yet as in other, more developed courses.
Poa=fine or "okay" Good=nzuri. But when complimenting someone on something they have done we say "vizuri" or "vyema"