Please provide full explanation not just the answer.

Vaughn Inc. acquired all of the outstanding common stock of Roberts Co. on January 1, 2020, for $276,000. Annual amortization of $21,000 resulted from this acquisition. Vaughn reported net income of $80,000 in 2020 and $60,000 in 2021 and paid $24,000 in dividends each year. Roberts reported net income of $50,000 in 2020 and $57,000 in 2021 and paid $12,000 in dividends each year.

What is the Investment in Roberts Co. balance on Vaughn's books as of December 31, 2021, if the initial value method has been applied?

A) $276,000. B) $317,000. C) $359,000. D) $368,000. E) $383,000.