Geometry

Question Analysis
This question tests the ability to distinguish cones from cylinders and cone-like figures.
The main focus is identifying the absence of a tapering apex, which disqualifies a figure from being a cone.

Key Concept Explanation
A cone must:
Have a single circular base
Have a curved surface that tapers to one apex
No flat top or multiple bases
A cylinder, by contrast, has two parallel circular bases and no apex.

Step-by-Step Solution
Option A: Apex off-center, circular base → oblique cone ✅
Option B: Circular base, fla...