Answer:
All of these infant traits can influence their care-giving environment and personality development.
Explanation:
Genotype is the genetic constituent of the individual whereas the phenotype is the physical constitution or physical appearance of the individual. The genetics studies these inheritance patterns of the phenotype and genotype.
Some traits are completely determined by the genotype of the individual. But some traits are also influenced by the environmental factors as well. The phenotype of the individual in this case depends on both the genotype as well as on the environmental factors that can influence the personality development as well.
Thus, the correct answer is option (a).