The tone of this sentence is considered optimistic or positive since the word perfect is used to describe what it is like to have a bunny for a pet. Also, since the word bunny is used rather than rabbit, the tone is casual and informal.
Answer:
The best choice is:
We heard unreliable rumors that the Delacroix brothers had disappeared.
Explanation:
We need to find a way to eliminate ambiguity in the sentence. In this case, ambiguity is being caused by an issue with the antecedent of the pronoun "they". In "We heard rumors that the Delacroix brothers had disappeared, but they were unreliable," "they" may refer to "rumors" or to "brothers". Even though we can assume the pronoun refers to "rumors", because of the word "unreliable" that follows it, the ambiguity is still there.
In "
We heard rumors about the disappearance of the Delacroix brothers, but we always thought they were unreliable," the revision made does not change anything. "They" can still refer to "rumors" or to "brothers". We can eliminate this option.
However, in "We heard unreliable rumors that the Delacroix brothers had disappeared," we no longer have any ambiguity. The pronoun "they" is not used anymore, and the adjective "unreliable" is placed right before "rumors", which makes its meaning clear. Thus, we can choose this option as the best one.
Answer:
The Andes were formed by tectonic activity whereby earth is uplifted as one plate (oceanic crust) subducts under another plate (continental crust). ... When this large portion of dense material was removed, the remaining portion of the crust underwent rapid uplift.
