أ Invented by Thomas Edison, was the electric light bulb, one of the many commercially successful products, an essential element of our modern lives. ب One of the many commercially successful products, an essential element of our modern lives was invented by Thomas Edison, the electric light bulb. ج The electric light bulb, an essential element of our modern lives, was one of the many commercially successful products invented by Thomas Edison. د An essential element of our modern lives, one of the many commercially successful products, was invented the electric light bulb by Thomas Edison.