Read the excerpt from "Opening Ceremonies of the New York and Brooklyn Bridge" by Hon. Seth Low, Mayor of the City of Brooklyn.

In the course of the construction of the Bridge a number of lives have been lost. Does it not sometimes seem as though every work of enduring value, in the material as in the moral world, must needs be purchased at the cost of human life? Let us recall with kindness at this hour the work of those who labored here faithfully unto the death, no less than of that great army of men who have wrought, year in and year out, to execute the great design. Let us give our meed of praise to-day to the humblest workman who has here done his duty well, no less than to the great engineer who told him what to do.

Which of the following best summarizes the central idea of this excerpt?

The mayor gently lectures on the importance of speaking kindly about those who have died.
The mayor commemorates and gives praise to those who were killed while building the bridge.
Low gives a monotonous explanation of the costs of the materials that were purchased for the bridge.
Low remembers those humble men who labored intensely and faithfully to execute this dream.