Geometry

Question Analysis
This question involves determining the similarity of cylinders by comparing the ratios of their radii and heights.
The main focus is on applying the similarity criterion for cylinders, which requires equal ratios of corresponding linear dimensions.

Key Concept Explanation
For two cylinders to be similar, the ratio of the radius of one cylinder to the radius of the other must equal the ratio of their heights.
This ensures that the shape of the cylinders is proportionally the same, just scaled differently.

Step-by-Step Solution
For Option A: , so the cylinders are similar.
For Option B: , so the cylinders are not similar.
For Option C: