The Teotihuacan civilization

a. flourished on the coast of Gulf of Mexico

b. was destroyed by the Spanish conquistadors

c. never expanded more than a few miles beyond the borders of the city

d. built the Pyramid of the Sun

The correct answer is the last one:

d. built the Pyramid of the Sun

It was not on the coast, but it was in the center of Mexico - first answer is false.

Also, it was destroyed long before the Spanish conquistadors - it was the Aztecs that were destroyed by the Spanish.

The third option is also false - it had an influence on a big area.