Which underlined phrase is the gerund phrase and predicate noun of the sentence?

a) Amy's sister's most annoying habit is hopping on the living room sister's most annoying habit is hopping on the living room couch.

b) My sister's most annoying habit is hopping on the living room sister's most annoying habit is hopping on the living room couch.

c) My sister's most annoying habit is hopping on the living room sister's most annoying habit is hopping on the living room couch.

d) My sister's most annoying habit is hopping on the living room couch.