Select the most appropriate option to fill in blank no. 1.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. it.
The sentence uses "it" as a dummy subject (also called an expletive subject). "It" is used to introduce statements about general situations, facts, or ideas.
In this structure, "it" does not refer to a specific noun but rather introduces the infinitive phrase ("to disconnect occasionally for the sake of our health") as the subject of the sentence.