Question

Fill in the blank with the right choice of word.

The assumption that chlorofluorocarbons would be ____ in the environment because they were chemically inert, was challenged by the demonstration of a potential threat to the ozone layer.

• A. deleterious
• B. innocuous
• C. persistent
• D. noxious
• E. durable

Answer 1

The correct option is B innocuous

Here, option B best befits the given context: the adjective "innocuous" which means not harmful or offensive fits the context of the given blank perfectly. As B fits into the context and conveys the meaning that the sentence requires of it, it is the correct answer.

The assumption that chlorofluorocarbons would be innocuous in the environment because they were chemically inert, was challenged by the demonstration of a potential threat to the ozone layer.

None of the other choices fit into the given context.