Question

who may take parenting responsibilities if biological parents cannot provide care?
grandparents
social workers
family acquaintances
friendly neighbors

Explanation:

In cases where biological parents can't provide care, grandparents are often in a position to take on parenting responsibilities due to family - relationship and emotional - bond factors. Social workers are mainly for providing support and guidance rather than direct parenting. Family acquaintances and friendly neighbors usually don't have the legal and close - family basis for taking on such responsibilities.

Answer:

grandparents