Questions: Which situation is the clearest example of cause and effect in "The City Without Us"? A. Unheated buildings would result in a destructive freeze-thaw cycle. B. While suspension bridges will last a few centuries, truss bridges may last 1,000 years. C. Water in Manhattan's underground spaces has to be pumped out daily. D. Central Park has a garden that houses plants mentioned in Shakespeare's plays.

The answer is A: Unheated buildings would result in a destructive freeze-thaw cycle.

Explanation for each option:

A. Unheated buildings would result in a destructive freeze-thaw cycle.
This option is a clear example of cause and effect. The cause is the lack of heating in buildings, and the effect is the destructive freeze-thaw cycle that would occur as a result. This cycle can lead to significant structural damage as water freezes and expands, then thaws and contracts, affecting the integrity of the building materials.

B. While suspension bridges will last a few centuries, truss bridges may last 1,000 years.
This statement compares the longevity of two types of bridges but does not illustrate a direct cause-and-effect relationship. It is more about the differences in durability and design rather than one causing the other.

C. Water in Manhattan's underground spaces has to be pumped out daily.
This statement describes a maintenance activity but does not directly illustrate a cause-and-effect relationship. It states a necessity rather than explaining what causes the need for daily pumping or the effects of not doing so.

D. Central Park has a garden that houses plants mentioned in Shakespeare's plays.
This is a factual statement about the contents of a garden in Central Park. It does not demonstrate a cause-and-effect relationship, as it merely describes what is present in the garden without linking it to a specific cause or resulting effect.