Final answer:
To create a more negative tone in sentence 12, the word 'terrified' should be used as it denotes intense fear and creates the strongest negative connotation.
Step-by-step explanation:
Choosing the best way to revise sentence 12 to create a more negative tone involves selecting a word with strong negative connotations. The connotative strength of words in options (a) to (d) increases from 'worried' to 'terrified', with 'terrified' carrying the most intense connotation of fear. Therefore, to revise sentence 12 with a more negative tone:
To create a more negative tone in sentence 12, the word 'terrified' should be used as it denotes intense fear and creates the strongest negative connotation.
The uncultivated, treeless plains stretching to the horizon terrified many emigrants.
This sentence revision uses the word 'terrified', highlighting the intense fear and trepidation the emigrants faced when they encountered the daunting expanse of the Great Plains.