The correct option is D
North-west
Method 1:
Taking clockwise direction as positive and anti-clockwise direction as negative,
90∘+135∘−270∘=−45∘=>45∘
Method 2:
After turning 90∘, She is looking in the East direction, then after turning 135∘ in the same direction, she would be facing the south-west direction. At last after turning 270∘ she would be facing the north-west direction.