Which of the fallowing best discribes why Czar Alexander II freed Russia's serfs?

Part 1: what is the difference between n and m? part 2: explain your answer for part 1.ask for details follow report by tanairymaldonad 5 days agoyour answer (quit)leonelclara32 ambitiousadd your answerleonelclara32rank: ambitious487/5000/5my challengesanswer 25 history questions in 48 hours to collect 400 points0/251d : 23hanswer 5 questions from any subject in 48 hours to collect 50 points5/5donetry it again! you may attempt only one challenge at a time.challenges to completeanswer 10 questions from any subject in 48 hours to collect 100 points0/102d : 00hstartyou may attempt only one challenge at a time.answer 25 questions from any subject in 48 hours to collect 400 points0/252d : 00hstartyou may attempt only one challenge at a time.answer 5 english questions in 48 hours to collect 50 points0/52d : 00hstartyou may attempt only one challenge at a time.answer 10 english questions in 48 hours to collect 100 points0/102d : 00hstartyou may attempt only one challenge at a time.answer 25 english questions in 48 hours to collect 400 points0/252d : 00hstartyou may attempt only one challenge at a time.answer 5 mathematics questions in 48 hours to collect 50 points0/52d : 00hstartyou may attempt only one challenge at a time.answer 10 mathematics questions in 48 hours to collect 100 points0/102d : 00hstartyou may attempt only one challenge at a time.answer 25 mathematics questions in 48 hours to collect 400 points0/252d : 00hstartyou may attempt only one challenge at a time.answer 5 social studies questions in 48 hours to collect 50 points0/52d : 00hstartyou may attempt only one challenge at a time.answer 10 social studies questions in 48 hours to collect 100 points0/102d : 00hstartyou may attempt only one challenge at a time.answer 25 social studies questions in 48 hours to collect 400 points0/252d : 00hstartyou may attempt only one challenge at a time.answer 5 history questions in 48 hours to collect 50 points0/52d : 00hstartyou may attempt only one challenge at a time.answer 10 history questions in 48 hours to collect 100 points0/102d : 00hstartyou may attempt only one challenge at a time.what do you need to know?

What is the direct object in the sentence yes, they will enjoy it very much

During sensitive periods of brain development like cell migration the brain is vulnerable to effects like: a. malnutrition b. infection c. toxins /drug use d. b and c e. all of the above