Marcus, an 18-month-old, lives in a two-parent family. He is securely attached to his mother. According to research, what type of attachment is he likely to have with his father?

A) insecure-avoidant
B) secure
C) insecure-resistant
D) There is not enough research on father-infant attachment to know Marcus's attachment.

B) secure. The type of infant attachment tends to be consistent from one parent to the other.