Plis help: What are the references presented by the following sentence? The family went on a trip to Costa Rica a month ago, when they appear there, they will stay to live

Which statement best describes the response by the united states and its allies to the berlin blockade? planes dropped tons of supplies around the city each day. trucks smuggled tons of supplies into berlin about once a week. tons of supplies were delivered to west berlin by boats. tons of supplies were purchased from east berlin each day.