Its Is used for repetition AND summary
Since there is no underlined word, I will just list everything here.
A - there is no indirect object.
B - there is no predicate adjective.
C - assuming that the underlined word is the leaves, direct object would be the correct answer.
D - there is no predicate nominative in this sentence.
Generally speaking, the maximum number of links in a food chain is 5.
Answer: 5
