Which responses most clearly show how a suffix can be used to change the word tumult into an adjective?
a. The suffixes -ous and -ness can be added to create the adjective tumultuousness.
b. The suffix -ary can be added to create the adjective tumultuary.
c. The suffixes -ous and -ly can be added to create the adjective tumultuously.
d. The suffix -ous can be added to create the adjective tumultuous.