What Was the Important Conclusion from Harlowe's Work with Monkeys

What was the important conclusion from Harlowe's work with monkeys and attachment?

A) Contact comfort is more important than association with food for developing attachment.
B) Food is the initial attraction but shifts to contact comfort as the infant matures.
C) Consistency was more important that either food or contact.
D) The effects of early neglect can be overcome later by adequate nutrition.