Answer:
La opción correcta a la cual se refiere la frase "el ciudadano es el eslabón clave en esta cadena de la sostenibilidad" es:
A. La viabilidad de una ciudad depende de sus habitantes.
Explanation:
The little piggies do their hog work as soon as they get home from school.
<h3>What is Riddle?</h3>
A riddle is known to be a kind of statement or a question that is said to have its meaning to be concealed or veiled and it is one that needs to be solved.
Note that The little piggies do their hog work as soon as they get home from school as it connote when piglets are born and how they start walking.
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Here are some aware, active, compassionate, conscious, receptive, sensible, sensitive, susceptible, and sympathetic. Hope this helps! ;D