B. subject
Step-by-step explanation:
A and D are wrong because there are no objects in the sentence.
C is wrong because, in this sentence, the predicate nominative is a noun phrase, a valuable lifelong skill. Hope this helps.
Answer:
A gerund is a verb form which functions as a noun.
Writing is a gerund in this sentence. It is the subject, which is a thing or idea that is doing or being something.
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