Which material is most suitable for taking an impression of a partially edentulous mouth for a diagnostic cast?

Explanation

Impression wax and modeling compound are not ideal for partial edentulous impressions due to their rigidity and lack of detail reproduction. Hydrocal is a type of dental stone, not an impression material. Hydrocolloid is preferred because it captures fine details and is flexible, making it suitable for diagnostic impressions in partially edentulous cases.