Answer:
D) Artists, naturalists, and tourists alike find the scenery of Point Lobos astonishingly beautiful.
Step-by-step explanation:
The sentence after the blank talks about visitor's hiking experience from "the water's edge". And the text before the blank space talks about different types of aquatic life present on the Pacific coast of California. Considering this fact and that sea otters and sea lines have already been discussed, we are left with only two options i.e. B and D. However point B is not cohesive with the text. Apart from visitors it also talks about Point Lobos (not cohesive with the text).
Moreover, the concept presented in option B is already discussed in the text after the blank space. So, option B is also excluded. Also consider the use of definite article "the" before "water's edge" in option D. It gives us a hint that "water's edge" should have already been mentioned before the blank space. From all this discussion it can safely be deduced that the most suitable sentence for filling the blank space is option D.