The outcome that would indicate codominance as the inheritance pattern for flower color in this species is:
D All offspring of a red X white cross would be spotted with red and white both being expressed.
In codominance, both alleles in a heterozygous individual contribute to the phenotype, and both traits are fully expressed, resulting in a mixed appearance such as spotted or striated patterns. In contrast, the other options represent complete dominance or blending inheritance rather than codominance.