Answer:
An ordinal scale
Step-by-step explanation:
As the scale is defined according to some scores and what is important more than the value is the order (High - Medium - Low) it fits with the description of an ordinal scale, in which more important than the number is the order. Also this type of scale measures non numeric concepts, like in this case where Leslie is studying anxiety, then more important that the number she wants to establish if the participants feel with a is high, medium or low level of anxiety.