"Give me back that notebook'
Answer:
The number of students who smoked electronic cigarettes increased slowly between 2011 and 2015.
Explanation:
Because the time line is from 2011 to 2015 and students slowly smoked in these years. So The number of students who smoked electronic cigarettes increased slowly between 2011 and 2015 is the correct answer
Mandela realised that his brothers and sisters were not free in their own country due to their colour. The freedom of everyone in his society was curtailed. He joined the African National Congress and fought for the freedom.