Of romanian-born orphanage children adopted by british families, children who were when they were adopted fared the best in weight gain after adoption.

Of Romanian-born orphanage children adopted by British families, children who were before age 6 months when they were adopted fared the best in weight gain after adoption.

Explanation:

The British have been on the forefront in adopting Romanian orphans for the last three decades. According to surveys, these orphans that were adopted before the age of 6 months gained better weight than the adopted orphans from any other age group. So, they got better nurturing from the neonatal period of their age itself.

pretty sure a is right

answer; the basal forebrain;