Select the most appropriate option to fill in blank number 1.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. caused.
Context: The sentence describes global warming as a phenomenon that has already been brought about by human activities. Therefore, the past participle form is required.
Meaning of the words:
Cause: verb in base form, not suitable here.
Causing: present participle, not fitting the passive construction.
Caused: past participle, correctly used in passive voice (“primarily caused by human activities”).
Causes: simple present verb form, does not fit the sentence structure.
Correct word: Caused
Reason: The structure “primarily caused by human activities” is grammatically correct and explains the origin of global warming.
Final Sentence: Global warming, a phenomenon primarily caused by human activities, has brought profound changes in weather patterns worldwide.
Hence, the chosen option is correct.