PART A: Which statement best summarizes the 1950s attitude towards space colonization versus the modern view on colonizing other planets? A The author argues that the reasoning behind space colonization in the 1950s was optimism, whereas now the motivation comes from distress and fear of the future. B The author argues that the 1950s attitude towards space colonization was motivated by competition in the space race, but it is now prompted by ambition and greed. C The author argues that the 1950s attitude towards space colonization was naive and unrealistic, whereas now it is pessimistic and desperate. D The author argues that the reasoning behind space colonization in the 1950s was hope in the future, whereas now the motivation comes from a desire to return to the past.