Answer: A. strange beautiful world
Step-by-step explanation:
Coordinate adjectives are words that modify the same noun in a sentence, and both have the same effect.
For example, "bright green" doesn't modify the same noun "plants", because bright modifies green, and green modifies the plant. These adjectives "bright green" used together are known as Cumulative Adjectives.
Cumulative adjectives are also called Hierarchical adjectives because they have an order of importance. For example, if the text stated "green bright plants" then the sentence would be wrong and sound incorrect too.
Whereas, "strange, beautiful" does modify the same noun "world" because they have equal effects if you switched them:
"strange beautiful world" or "beautiful strange world" because the world can be both strange and beautiful at the same time, so these adjectives coordinate with each other. You can use a comma with these adjectives or the word "and":
"strange, beautiful world"
but you can't use a comma or "and" with "bright green plants"
because "bright and green plants" doesn't make sense and "bright, green plants" would be incorrect since the adjectives are modifying different parts of the sentence.