Final answer:
The hydrophilic heads of phospholipids will be attracted to water in order to reform the bilayer.
Step-by-step explanation:
When the bilayer of phospholipids is broken down, the part of the phospholipid that will be attracted to water in order to reform the bilayer is the hydrophilic heads.
Phospholipids have a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail. The hydrophilic heads are attracted to water, so when the bilayer is broken down, the hydrophilic heads will interact with water to form the new bilayer.