Select the most appropriate option to fill in blank number 1.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. most.
Context: The sentence is talking about how efficient the circulatory system is compared to all other systems in the human body, implying a superlative degree.
Meaning of the words:
- Most: Greatest in amount or degree; superlative of “much” or “many”.
- Many: A large number of; used with countable nouns.
- More: A comparative form used when comparing two things.
- Several: More than two but not many; an indefinite number.
Correct word: Most
Reason: The sentence is using a superlative structure to express that the circulatory system is one of the most efficient (i.e., among the highest in efficiency) systems. Only “most” fits grammatically and contextually here.
Hence, the chosen option is correct.