You don't have the options, but i would say it means that books can take us to another place mentally and take us away from our problems. Hope it helps !:)
For outdoor trials, these have been carried out by the Mosquito Research and Control Unit Cayman, the Gorgas Memorial Institute in Panama, the Institute for Medical Research in Malaysia, Moscamed and the University of São Paulo in Brazil. In each and everyone of the outdoor suppression trials the wild population of Aedes aegypti<span> in the areas has been decreased by over 90%.</span>
Duty, in a way, contributed to the shallowness and failure of Ivan's life. Not because duty in itself is bad, but because it has become Ivan's only preoccupation, apart from pleasant life. Tolstoy's negative view of duty is seen in the second half of this sentence: "he considered his duty all things that were so designated by people in authority". So, we are talking about duty as Ivan sees it, and Ivan sees it as it was designated by people in authority. That means, Ivan structures his life and his priorities according to the view of those above him. His only ambition is to try and climb the social ladder. When he fails to do it, he is disappointed and has to find another obsession - of course, materialistic one. And that is the decoration of his new house. That's when he falls down and injures himself - so, indirectly, his materialism has cost him his health and, ultimately, his life.
The best answer to the statement given above is option b. false. Most people who become addicted to drugs are NOT able to stop on their own and need outside help. Those people who are addicted to drugs have difficulty to abstain from it because these drugs created an addictive pleasure to the body which makes them crave for it. If the urge is not satisfied, drug users often suffer from withdrawal symptoms. This is the time that they need outside help, that's why they need to undergo rehabilitation.