Pictorial sketch categories: Axonometric, oblique, and perspective techniques all depict objects pictorially to convey 3D form on a 2D sheet.

Introduction / Context:
Pictorial drawing communicates three-dimensional form in a single view, improving comprehension during concept and presentation stages. This question checks classification of common pictorial methods.

Given Data / Assumptions:

• Axonometric includes isometric, dimetric, and trimetric—parallel projectors, no vanishing points.
• Oblique projects depth along receding lines at a chosen angle, preserving the true size of the front face.
• Perspective uses converging projectors (vanishing points) for realistic depth.

Concept / Approach:
Though their projection rules differ, all three convey 3D in a single picture plane. Axonometric is measurable along certain axes; oblique distorts depth by choice; perspective matches human vision but sacrifices direct measurability.

Step-by-Step Solution:
Identify the defining characteristic of “pictorial” — a single-view 3D depiction.Confirm that axonometric, oblique, and perspective each meet this definition.Therefore, the assertion that they show objects pictorially is correct.

Verification / Alternative check:
Reference drawing manuals categorize these three under pictorial methods distinct from multiview orthographic drawings.

Why Other Options Are Wrong:
Claims that only one is pictorial or that perspective is “technical, not pictorial” conflict with standard taxonomy. Oblique is not orthographic; it is a pictorial with receding axes.

Common Pitfalls:
Assuming pictorials are suitable for precise dimensioning; multiview orthographic remains the standard for manufacturing dimensions.

Final Answer:
Correct