You need to ask Trinity College about your assignments.
Aside from that you should be aware that:
- Roman numeral analysis (RNA) exists in several systems and not all use marks like
+, or upper/lower case to indicate chord quality. The most basic RNA is Roman numerals (usually upper case) that denote only the scale degree of the chord root.
- Regardless of how you might label a chord, the diatonic chord on the second scale degree in minor keys is a diminished triad. Some RNA systems will label it
II, other systems will label it
- The chord on the second degree could take another quality. For example if could be a major chord, like
V/V, which would be a major chord.
So if asked ii in A minor in SATB chords, whether I have to write B minor or B diminished?
Check with your teacher. I would expect, without more context, the question meant which diatonic triad for
ii? and they are using a key signature of no sharps/flats for
A minor. In which case the chord is
The important thing is that you can explain why you would answer one way or the other, or why the question - at least as you have worded it - it unclear.