Select the most appropriate option to fill in blank number 4.
Show answer & explanation
Correct answer: D
Explanation
Correct Answer: Option 4) retreat
Solution:
The sentence states a general truth about the effects of global warming, so it requires the Simple Present Tense.
As a result, glaciers retreat, sea levels rise, and extreme weather events have become more frequent and severe.
Here, 'glaciers' is a plural subject, so the correct verb is 'retreat' (base form). The other options are incorrect because:
retreating – Present participle; requires an auxiliary verb (are retreating).
retreated – Past tense; does not fit the context of a general fact.
retreats – Used with a singular subject, whereas glaciers is plural.
Therefore, 'retreat' is the most appropriate choice.