Just like Congress is the legislative branch of the Federal Govt of the US, so Parliament is the legislative body of the United Kingdom of Great Britain and Nothern Ireland.

A) as underlined
B) As Congress is the Legislative branch of the Federal Govt of the US,
C) As Congress is the Legislative branch of the Federal Govt of the United States, in the same way
D) Just as Congress is the legislative branch of the Federal Govt of the US, so
E) Just as the Federal Govt of the United States' legislative branch is Congress,

Source : Kaplan GMAT Verbal workbook

Am confused between 2 options , i will name them once someone has a chance to solve the question and evaluate the choices.

cheers,
pd