Which of the following is a synonym for 'to find out'?

The term "ascertain" accurately serves as a synonym for "to find out" because it conveys the meaning of discovering or determining information through investigation or inquiry. When someone ascertains something, they actively seek out to gain knowledge or understanding of a particular matter. This aligns perfectly with the essence of "finding out."

The other options do not match this meaning: "bequeath" refers to leaving property or rights to someone through a will, "expunge" means to erase or remove completely, and "disperse" indicates the act of distributing or spreading out. None of these terms relate to the concept of discovering or uncovering information.