Which type of segmentation divides consumers based on when they get the idea to buy, actually make their purchase, or use the purchased item?

D. Purchase occasions

Behavioral segmentation divides consumers into groups based on their knowledge of, attitude toward, use of, or response to a product. Purchase occasions refer to when consumers get the idea to buy, actually make their purchase, or use the purchased item, making it a direct basis for behavioral segmentation.

• Age group and income level are bases for demographic segmentation.
• Geographic location is a basis for geographic segmentation.

The final answer is $\text{D}$.