Step 1: Define Soft Ground Etching. It is a specific type of (D) Etching. The process involves covering a metal plate with a soft, waxy ground. A drawing is then made on paper placed over the ground, and the wax adheres to the paper where pressure is applied. When the paper is lifted, it pulls the ground off the plate, exposing the metal to be bitten by acid.
Step 2: Identify the materials used. Like other etching techniques, soft ground etching is an intaglio process performed on metal plates. (B) Zinc plate printing is a common application, as zinc is a popular metal for etching.
Step 3: Eliminate incorrect options. (A) Wood Cut is a relief technique and does not use etching. (C) Stone printing refers to lithography, which is a planographic technique. Therefore, the process is used in both (B) and (D).