For now , just ignore the constant 5/9 *32
c = 5/9 f when f changes 1 c changes 5/9 so A is true
when f changes 5/9 c changes 25/81... not 1 so C is untrue
(as an aside when f changes 9/5 c changes 1 )
re-arrange
9/5c = f when c changes 1 f changes 9/5 or 1.8 so B is true
D) I and II only