The conversation between human and AI assistant.
[|Human|] Choose the correct and complete sentence:

A) Maria was supposed to meet me at the station
B) Maria were supposed to meet me at the station
[|AI|] The correct and complete sentence is:

A) Maria was supposed to meet me at the station.
[|Human|] 
Choose the correct and complete sentence:

A) Maria was supposed to meet me at the station
B) Maria were supposed to meet me at the station