Select the most appropriate option to fill in blank number 4.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Therefore.
Context: The sentence explains a cause-and-effect relationship — since blood is pushed out under high pressure, the arteries must be strong and muscular.
Meaning of the words:
- But: Used to introduce a contrast.
- Although: Used to show contrast despite something.
- Because: Used to show reason or cause.
- Therefore: Used to show result or consequence.
Correct word: Therefore
Reason: The sentence is stating the result of high pressure in the arteries — they need to have thick and muscular walls. “Therefore” correctly introduces this logical consequence.
Hence the chosen option is correct.