Read the excerpt from "Lise Marie de Baissac.”In Normandy, Baissac pretended to be a refugee from Paris living in the house of a schoolmaster. There, she helped to set up more resistance groups and organize sabotage actions. Again traveling by bicycle, she maintained secret communications between groups and transported supplies. This was extremely dangerous work.
The excerpt says Baissac maintained secret communications between resistance groups. To maintain communications means to keep them going or continue them. Therefore, “kept up” is the correct choice.
AI-written and checked against the verified answer.