The word 'unfathomable' means not able to be understood.
to 'fathom' is to think or ponder on something so as to understand it.
Labor-saving devices are inventions that reduce the time and effort needed to perform or complete a task. Farm equipment, home appliances and construction equipment are examples of mechanical inventions that save time and physical labor.
The answer would be A. The Neighbors.
Answer:
A natural attraction, liking, or feeling of kinship