Select the most appropriate option to fill in blank no. 5.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. recognised.
Context: The passage is discussing the harmful effects of tobacco and cigarette smoke. It states that tobacco smoke is known to be a cause of cancer and other diseases. The blank refers to how tobacco smoke has been universally accepted or acknowledged in scientific and medical communities.
Recognised means acknowledged or accepted as true or valid. The sentence implies tobacco smoke has been formally acknowledged as a cause of cancer. Only recognised fits this meaning logically and grammatically.