28-24: Until the passage of the Piracy and Counterfeiting Amendments Act in 1982, a first-time charge of copyright infringement was merely a misdemeanor charge, federal prosecutors being unlikely in pursuing criminal copyright infringers, while offenders were subject to relatively small penalties.

A: charge, federal prosecutors being unlikely in pursuing criminal copyright infringers, while offenders were

B: charge, with federal prosecutors who were unlikely to pursue criminal copyright infringers, offenders being

C: charge, federal prosecutors unlikely to pursue criminal copyright infringers, while offenders were

D: charge; therefore, federal prosecutors were unlikely in pursuing criminal copyright infringers and offenders being

E: charge; therefore, federal prosecutors were unlikely to pursue criminal copyright infringers, and offenders were

我选了E,但总觉得C也对，大家都选了什么？

c的问题：

（1）在整个句子中，federal prosecutors unlikely to pursue criminal copyright infringers是什么成份？

（2）while在此作何解释？表对比转折还是什么呢？逻辑意思和词的位置都有问题。