Answer:
B: Appositive Phrase
Step-by-step explanation:
Appositives are nouns or noun phrases that follow or come before a noun giving more information about it (noun).
In this example the appositive phrase "famous actress" follows Susan Sarandon and gives more information about it (Susan - a noun).
Another example could be like this,
William Wordsworth, a romantic poet, had remained Poet Laureate of the United Kingdom from 1843 to 1850.