Ethos in a persuasive argument is the credibility of the person making the argument so it would be D. For future reference, think of commercials with the people saying that the product being shown worked well for them.
Answer:
Group I. If the root is a full word, the ending is usually -able.
Group II. When the root is a full word except for a final e, the forms usually are spelled with -able and drop the finale.
Group III. The suffix -able always follows the letter i. Thus, if you follow our English custom of changing y to i in these words, you will add -able.
Group IV. When the root has other forms built on the letter a, the -able form is used.
Group V. When the root ends in hard c orhard g, -able is used. The suffix -able is the only possible ending after hard c or g, in order to keep the proper pronunciation.
Group VI. When the root is not a full word, -ible is used.
Group VII. When the word has an immediate -tion form, -ible is used.
Group VIII. When the root ends in ns, miss, or soft c or g, -ible is used.
It belongs in the stimulant category
To keep the paragraph sounding relevant to the topic and adding detail to the topic
