Golombok Et Al

Golombok et al. compared families whose children were conceived naturally vs. conceived via reproductive technology vs. children who were adopted. Which is an accurate statement about their results?

A) Degree of genetic ties between parents and children is positively correlated with parenting effectiveness.
B) At the time of a longitudinal follow-up, parents who had difficulties conceiving were the warmest and most emotionally involved with their children.
C) Children who were conceived naturally were more socially adjusted than children conceived via reproductive technology.
D) Parents' strong commitment to parenthood may be more important than degree of genetic relatedness.