計(jì)劃歷時(shí)=12個(gè)月，ACWP = $10,000，BCWP = $14,000，BCWS = $17,500, BAC = $28,000根據(jù)上述數(shù)據(jù)，現(xiàn)在是第六個(gè)月的結(jié)束，完成項(xiàng)目所需的剩余的時(shí)間是多少？
A. 6個(gè)月
B. 8個(gè)月
C. 9個(gè)月 
D. 4個(gè)月