芳香公司各區資料如下:東區中區西區售價:$60,000100%$80,000100%$40,000100%變動成本30,00050%48,00060%28,00070%邊際貢獻30,00050%32,00040%12,00030%直接固定成本18,00030%12,00015%10,00025%各區邊際貢獻12,00020%20,00025%2,0005%分攤共同固定成本6,00010%8,00010%4,00010%各區收益6,00010%12,00015%-2,000-5%根據上述資料,若芳香公司關掉西區營業處,則公司的淨收益為何?
(A)$20,000
(B)$18,000
(C)$16,000
(D)$14,000