Sentence Correction

A commemorative silver dollar coin, issued in the same year as the bicentennial of Lewis and Clark's expedition were celebrated, features the likeness of Meriwether Lewis and William Clark on the obverse and two feathers on the reverse.

(A) A commemorative silver dollar coin, issued in the same year as the bicentennial of Lewis and Clark's expedition were celebrated,

Eliminated A because bicentennial is singular and were is plural.

(B) A commemorative silver dollar coin, issued in the same year of celebration as the bicentennial of Lewis and Clark's expedition,

Eliminated B because it didn't sound right.

(C) A commemorative silver dollar coin was issued in the same year that the bicentennial of Lewis and Clark's expedition was celebrated,

(D) A commemorative silver dollar coin, issued in the same year that the bicentennial of Lewis and Clark's expedition was celebrated,

(E)Issued in the same year as the bicentennial of Lewis and Clark's expedition were celebrated, a commemorative silver dollar coin

Eliminated E because bicentennial is singular and were is plural.

Answer is D

I don't understand why C is wrong and D is right.
Can someone please explain?

Thanks!