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heapify only the nodes: [18, 14, 44] in reverse order.Heap sort is a comparison-based sorting approach based on the Binary Heap data structure. What is Heap Sort?Heap sort is a comparison-based sorting approach based on the Binary Heap data structure. It is similar to the selection sort in that we first identify the minimal element and set it at the beginning. Repeat for the remaining items.Efficiency - The time required to do Heap sort grows logarithmically, whereas alternative methods may grow exponentially slower as the number of objects to sort grows. This sorting method is extremely efficient.Memory Usage - Memory usage is small since, aside from what is required to keep the initial list of things to be sorted, it requires no further memory space to function.Simplicity - It is easier to grasp than other equally efficient sorting methods.Total Nodes = 5Last Non-leaf node index =(5-1)/2 = 2Therefore, last non-leaf node = 3To build the heap, heapify only the nodes: [18, 14, 44] in reverse order.To learn more about : Heep SortRef : https://brainly.com/question/20248815#SPJ4