It should result evident for you that two of the options shown are not correct a) 100 cg is not 1 g and d) 1 kg is not 1 g. 1 kg is 1000 g, because the k prefix is used to indicate one thousand. These are the right equalites for all a) 1 kg = 1000 g; and 1 kg = 100 cg, => 1000 g = 100 cg => 10 g = 1 cg; b) 1000 mm = 1 m; c) 1 cm^3 = 1 ml; and 10 kg = 10,000 g. Given that the question requires to select only one option, it means that there is a typo in your question, but the given explanation is enough to understand and answer the question.
