Answer:
We must choose al the things you can find in El Salvador.
Pupusas: Are like tortillias, and you can find them in El Salvador, because they are a mixture of Hispanic culture and native culture. This is a correct option.
Pedro infante: Was a singer and actor from México, so you can not find him in El Salvador.
Ruta de las Flores: is a route in El Salvador that goes from Nahuizaico to Ahuachapan, so this is a correct option.
artesanía: This means "handcrafted art" you can find these type of things made by the natives almost everywhere, wo you can find them in El Salvador, this option is correct.
música norteña: This is a type of music from México, so this is not a correct option.
El Tango: El tango comes from Argentina and Uruguay, so this is not a correct option.
Fernando Llort: He was a visual artist from El Salvador, so this is a correct option.
Joya de Cerén, la Pompeya de las Américas: is a pre-Columbian site of El Salvador located in the vicinity of San Juan Opico and Las Flores, this is a correct option.
Frida Calo: She is from México, so this is not a correct option.
Playas de arena negra: This means "black sand beaches", in El Salvador there is one beach with black sand, so this is a correct option.
Diego Rivera: He was a muralist from México, so this is not a correct option