Final answer:
The Drosophila multinucleated cell formed early in development is known as a syncytium. It occurs after the zygote undergoes cleavage and before the formation of the cellular blastoderm. Therefore, the correct option is c.
Step-by-step explanation:
The name of the Drosophila multinucleated cell formed early in development is syncytium. During the initial stages of embryonic development, after the zygote undergoes cleavage to produce numerous cells, a specialized structure known as a syncytium forms. This is a stage where multiple nuclei are present in a shared cytoplasmic space without the segregation of individual cells by membranes, which is a key feature of the Drosophila embryogenesis process before the formation of the cellular blastoderm. Syncytium formation is typically observed after the rapid cell divisions of the zygote, resulting in a large number of nuclei within the same cell membrane before they individually get surrounded by cellular plasma membranes.