The protists which form spores after meiosis

Explanation

The correct answer is Apicomplexans. Apicomplexans are a group of protists that are characterized by their ability to form spores following meiosis. This is a crucial part of their life cycle, especially in parasitic species such as Plasmodium, which causes malaria. They undergo sexual reproduction that leads to the formation of spores, aiding in their transmission and infection processes. The other options, such as Myxomycota, Oomycetes, and Dinoflagellates, have different reproductive strategies or lifecycle characteristics that do not primarily involve spore formation immediately after meiosis.