input: Write a function to recommend an option based on the lowest cost-to-rating ratio.
  assert recommend_option([{'name': 'Option1', 'cost': 100, 'rating': 4}, {'name': 'Option2', 'cost': 200, 'rating': 5}]) == 'Option1'
  assert recommend_option([{'name': 'Option1', 'cost': 150, 'rating': 3}, {'name': 'Option2', 'cost': 300, 'rating': 4}, {'name': 'Option3', 'cost': 100, 'rating': 2}]) == 'Option3'
  assert recommend_option([{'name': 'Option1', 'cost': 120, 'rating': 3}, {'name': 'Option2', 'cost': 240, 'rating': 5}, {'name': 'Option3', 'cost': 100, 'rating': 3}]) == 'Option1'
output: def recommend_option(options):
      return min(options, key=lambda x: x['cost'] / x['rating'])['name']