Concord in informal spoken English

"The government are considering changes" is an example of ...
1. An error of concord
2. Proximity concord
3. Notional concord
"Half the students are below average" is an example of ...
1. An error of concord
2. Proximity concord
3. Notional concord
"Someone's standing in the dark over there and they look dangerous to me" is an example of ...
1. An error of concord
2. Avoiding he/she naturally in spoken English
3. Correct concord
"Wind and rain is common here" is an example of ...
1. An error of concord
2. Treating weather conditions as a singular binomial
3. Notional concord
"The class who are in Room 6 need a teacher" is an example of ...
1. An error of concord
2. The tendency in English to treat humans in the plural when we use 'who'.
3. Proximity concord
"Neither of you are allowed to come" is an example of ...
1. An error of concord
2. Notional concord
3. Proximity concord
"There are a variety of reasons" is an example of ...
1. An error of concord
2. The informal but acceptable use of a plural with a classifying noun, 'variety'
3. Proximity concord
"The police are coming soon" is an example of ...
1. An error of concord
2. A slightly unusual idiomatic use in English.
3. Proximity concord
"The staff is polite" is an example of ...
1. An error of concord
2. Notional concord not happening
3. Proximity concord
"The data is unclear" is an example of ...
1. An error of concord
2. Notional concord
3. Proximity concord