Among the statements you provided about Ecuador, the following is true:
Most Ecuadorians can trace their heritage to colonial era Spain.
While Ecuador has a diverse population with indigenous, mestizo (mixed indigenous and European), and Afro-Ecuadorian communities, many Ecuadorians do have Spanish ancestry due to the colonial period.
To clarify the other statements:
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Its capital city is the highest in the world: While Quito, the capital of Ecuador, is one of the highest capital cities, it is not the highest in the world. La Paz, Bolivia, holds that title.
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Its climate is similar throughout the country: Ecuador has diverse climates that can vary significantly across different regions, including the coastal region, the highlands (sierra), and the Amazon rainforest.
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It is difficult to use public transportation in the metropolitan areas: This statement can be subjective and varies by individual experience. While some may find public transportation in metropolitan areas like Quito to have challenges, others may find it accessible and effective.
So the most accurate statement of the options provided is about the heritage of Ecuadorians tracing back to colonial-era Spain.