In the following passage, some words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

Sharks are some _________ the most regal and amazing creatures in the sea, though sometimes referred to as ‘beasts’ or ‘killing machines’ they are way more docile that humankind is ______ to believe. Sharks are more ______ than common Great White shark that is so often portrayed in the movies. Sharks have some of the strongest olfactory senses in the marine world ______ is why there is common belief that a shark can sense 1 drop of blood mixed in a hundred drops of water. ­­­­­________ the violent enactment of this amazing creature of the seas they are surprisingly calm until they are poked and prodded.