The popularity of RNA interference (RNAi) technology is largely attributed to its versatility in various therapeutic applications, particularly in gene silencing, which can effectively target and regulate gene expression associated with diseases, including cancer. Additionally, RNAi is instrumental in developing genetically modified crops that exhibit resistance to viral pathogens, thus enhancing agricultural resilience. However, while RNAi holds promise in a variety of therapeutic contexts, its current utility in hormone replacement therapies is not a recognized application, making options 1, 2, and 4 the correct choice.