The correct answer to complete the sentence would be "D. Others". Let's break down the sentence and the options to understand why. The sentence states that "Some people are lazy." This means that a certain group of people possess the characteristic of being lazy. Then, the sentence continues with "______ are energetic." This suggests that there is another group of people who are energetic. We need to choose an option that represents this second group of people. Let's evaluate the options: A. "Other" - This option does not work because it is singular, whereas we are looking for a plural noun to represent a group of people. B. "Another" - This option does not work either because it implies a separate individual, rather than a group of individuals. C. "The other" - This option also does not work because it suggests that there is only one other group of people, when in fact, there could be multiple groups of people who are energetic. D. "Others" - This option is the correct answer. It is plural and implies multiple groups of people who are energetic, contrasting the group of people who are lazy. In conclusion, the correct answer to complete the sentence would be "D. Others".