What is the best topic sentence for an article about whether or not certain genes play a favorable role in human evolution?

"jumping genes," or transposable elements, are dna sequences that have the ability to replicate and move from one chromosome to another.
nobel laureate barbara mcclintock first reported this phenomenon in 1951, but few other scientists believed her findings at the time.
jumping genes have the unsavory reputation of causing genetic mutation or cancerous cell growth.
challenging the notion that jumping genes are "junk" genes, recent b

You question is incomplete, because I cannot read the final option - it isn't finished.
However, based on the options I can read, the best  sentence for an article about whether or not certain genes play a favorable role in human evolution is the third one - jumping genes have the unsavory reputation of causing genetic mutation or cancerous cell growth.
The other two options say nothing about the role of certain genes, they just state some facts. 

The  correct answer should be a waste

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.