General Advice on the Questions

Hint 1 of 4:

Always get the opinion of your entire crew.  Talk to them all until they've
run out of new things to say.

Hint 2 of 4:

If you want, you can ask the Brassican any sensible questions that you're
offered.

Hint 3 of 4:

I wouldn't ask for hints, though.  It may cost you mission points.  Nothing
else you can say really seems to make a difference either way.

Hint 4 of 4:

When you have your answer, use the appropriate crew member on the Brassican. 
You won't be told if you're right or wrong, though.