Choose an option from the four given options that correct the error in the underlined phrase.
The World Wildlife Fund has declared that global warming, a phenomenon most scientists agree to be caused by human beings in burning fossil fuels, will create havoc among migratory birds by altering the environment in ways harmful to their habitats.

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a phenomenon most scientists agree to be caused by human beings in burning fossil fuels,

answer is C.

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Concept: In the given question we are presented with a passage. There are some grammatical errors within the underlined sentence and that we must choose one among the given options to correct the identical.
Before visiting the choices, we must take a glance at the phrase and check out to spot the words that appear inadequate for the given passage.
We are going to notice that the words ‘to be’ after the word ‘agree’ seems to be an unnecessary addition. together with this, ‘in burning fossil fuels’ is grammatically incorrect.
Keeping this in mind, allow us to observe the given options.
Option ‘A’ is wrong because it is that the same because the sentence within the question.
Option ‘B’ is inaccurate thanks to the position of ‘that’, it's modifying the word phenomenon and must hence be placed right after it.
Option ‘D’ is wrong as this feature is unnecessarily long and sophisticated.
Therefore, the right option is option ‘C’, it's grammatically accurate also as concise.
Hence, option C is the correct answer.