OG262句子结构分析

262. Initiated five centuries after Europeans arrived in the New World on Columbus Day 1992. Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.

(A)   Initiated five centuries after Europeans arrived in the New World on Columbus Day 1992, Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.

(B)   Initiated on Columbus Day 1992, five centuries after Europeans arrived in the New World, a $100 million investment in the search for -extraterrestrial intelligence was pledged by Project SETI.

(C)   Initiated on Columbus Day 1992, five centuries after Europeans arrived in the New World, Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.

(D)   Pledging a $100 million investment in the search for extraterrestrial intelligence, the . initiation of Project SETI five centuries after Europeans arrived in the New World on Columbus Day 1992.

(E)   Pledging a $100 million investment in the search for extraterrestrial intelligence five centuries after Europeans arrived in the New World, on Columbus Day 1992, the initiation of Project SETI took place.

key is C.想问问c中的five centuries after Europeans arrived in the New World在整个句子中作什么成份？是Columbus Day 1992的同位语么？我知道名词可以做同位语，但是名次+从句作同位语好像没有见到过。