Read this excerpt from "Painting Freedom on the Walls." When a wave of Mexican settlers began to come to San Diego in the 1890s, many of them made their home in an area known as Logan Heights. Soon that area was called Barrio Logan. (In Spanish, a barrio is a neighborhood.) At first, Barrio Logan was a neighborhood of homes and shops that stretched from well inland all the way to San Diego Bay, and the people had access to the beach. Then, during World War II, the beach was closed. In the 1950s, the city changed the zoning of the area so that industry could move into the neighborhood. Soon, the barrio was spotted with noisy, dirty junkyards. In the 1960s, Interstate 5 and ramps for the San Diego-Coronado Bridge cut Barrio Logan in half. About 5,000 homes were destroyed in the process.

By this time, the residents were very angry about the terrible damage to their barrio. They protested loudly. Finally, the City Council of San Diego promised them a park to help make up for the damage. The council set aside land for that purpose. And then, in 1970, bulldozers arrived to turn the land into a parking lot. A student, Mario Solis, saw them, asked what was going on, and started spreading the word. Within a few hours, there were 250 people in the park, blocking the bulldozers.

The people of Barrio Logan won their battle and got their park. They planted cactus and other native plants, but there was something missing. An artist named Salvador Torres came up with the idea of putting murals on the concrete pillars that supported the freeway. Chicano Park was born.

Which event inspired the idea to paint murals in San Diego?

A. beach closures during World War II
B. the construction of Interstate 5
C. the number of new settlers in the 1890s
D. an artist looking at concrete pillars