That is incorrect.
Icing would be expected in clouds where the temperature falls between -2 and -15°C.
The correct answers are a) Clear and c) Mixed.
Clear icing from 650 to 575 hPa, where the temperatures are between -2 and -7°C.
Mixed (rime and clear) icing from 575 hPa up to 500 hPa, where
the temperatures are slightly colder.