If 4-Month-Old Jacob Has Developed an Understanding of Object Solidity

If 4-month-old Jacob has developed an understanding of object solidity, then he will dishabituate more strongly on the drawbridge task when:

A) the solid object stops the drawbridge from making a full arc
B) the drawbridge passes unobstructed through a solid object
C) the solid object passes unobstructed through the drawbridge
D) the drawbridge makes a full unencumbered 180° arc