Read the article below and answer the question that follows.
Science Mysteries: How Many Species Are There?
You might think that after 200 years, the scientists who find, name, and describe Earth's species would be close to finished. But taxonomists, as organized as they may be, have no idea how many species Earth has. Nor can they even provide an educated guess. Although reporting over 16,000 new species every year, taxonomists still cannot predict how many more are undiscovered.
In total, taxonomists have categorized and listed 1.2 million species on Earth. At this point, you would think scientists should be able to use the information they have gathered to make good predictions about how many species an ecosystem can support. This would help them make better predictions about how many species are left to identify. So far, however, the guesses seem to vary so greatly that it seems there is no good theory for making a prediction.
One of the main problems is that most of the places that seem to have a lot of diverse species are in places that are hard to get to. One such place is the ocean, where scientists believe some 80 percent of Earth's creatures are hiding at depths too deep for us to study. In addition, many of the planet's most diverse areas are in remote places with few taxonomists.
Despite all the unknowns, scientists have agreed that there are between five and 15 million species left to discover on Earth. This is a huge range, but whether it's five or 15, taxonomists clearly still have a lot of work to do. And who knows, there may yet be a dragon or a Loch Ness monster left to discover.
Which of the following best paraphrases the paragraph in bold?
a) One problem is that lots of places that may have lots of diverse species are hard to get to. Take the ocean, where taxonomists believe 80 percent of species are hiding. Also, the planet has diverse areas with remote places.
b) Scientists have difficulty finding and identifying over three-quarters of the world's species due to their habitats being out of human reach. Due to deep oceans and isolated locations, many species will go undiscovered.
c) The depth of the ocean makes it tough to see things.
d) There is an issue with locating a large number of species because of the ocean.