Based on your description mentioning DNA replication, mitosis, and the type of cells involved, it seems you are asking about the type of cell after these processes. Here's a breakdown of the options you provided:
- Polyploid cell - More than two sets of paired chromosomes (e.g., tetraploid, hexaploid).
- Triploid cell - Three sets of paired chromosomes (e.g., 3n).
- Diploid cell - Two sets of paired chromosomes (e.g., 2n).
- Haploid cell - A single set of unpaired chromosomes (e.g., n).
Since you mentioned "DNA replication, then mitosis," the typical result is that you will end up with daughter cells that are diploid if starting from a diploid parent cell (assuming typical somatic cell division in organisms like humans).
So, if the context implies normal mitotic division from a diploid parent cell, the correct answer would be:
Diploid cell - two sets of paired chromosomes.