The correct answer is (B) To freeze; to solidify by cooling; to change from fluid to solid, as by cooling or freezing; to coagulate; to make or become fixed (sentiments, principles, etc).

Congeal comes from Middle English congelen, Latin congelare (con [together] + gelare [to freeze]).

Examples of use:

• The fat congealed as the frying pan cooled.
• After weeks of discussion, her plans had congealed.