Final answer:
Candace and Christina are engaging in parallel play, which is when children play next to each other but do not interact.
Step-by-step explanation:
Candace and Christina are sitting side by side playing with their dolls without interacting with each other; this describes a form of play known as parallel play. In parallel play, children play adjacent to each other but do not try to influence one another's behavior. This type of play is common among toddlers who are still developing social skills and is distinct from other types of play such as nonsocial (playing alone), associative (playing interactively without organization), and cooperative play (playing together with organized roles and activities).