You can draw. You are amazing.
Texture is the way something feels to the touch, or looks to the eye. Words like rough, silky, shiny and dull help writers describe the texture of an object. An artist shows texture to accomplish the same goal. There are two types of texture: tactile and visual.
Answer - A. Engraving
Simple Explanation Reason - Why it was difficult is because of learning the technique. Since it was less common then Printmaking used with etching.
Credit Researched - Engraving - Wiki-Pedia