Number 7 is what I need help on please

Ithink its b) built underground reservoirs

Ou will hear a story in spanish. it’s rather lengthy. as you listen to the story, take notes on scrap paper.listen a second time, and as you listen, make your notes more complete. in english, summarize thestory in a composition of between ten and twenty sentences. print or type the final version of your summaryin the appropriate location on the answer sheet provided at the back of this study unit. do not sendany scrap paper or notes to the school

Es cierto que marcos vendrá a la fiesta.