Answer: C) Mark Covington could think of one way to rebuild his neighborhood: establish a community center and garden where the vacant lot used to be.
Step-by-step explanation: a colon is a punctuation mark that is used to mark a major division in a sentence, to indicate that what follows is an elaboration, summation, implication, or explanation of what precedes. From the given options, the sentence that uses the colon correctly, is the corresponding to option C, because it is introducing further information about how Mark Covington wanted to rebuild his neighborhood.