Which replacement corrects the spelling error in this sentence?
In the early 1990s, my uncle started studying architecture, and except for two years he spent in the Peace Corps, its the only thing he has done since.
A. In the early 1990 s, my uncle started studying architecture, and except for two years he spent in the Peace Corps, it's the only thing he has done since.

B. In the early 1990 s, my uncle started studying architecture, and except for too years he spent in the Peace Corps, its the only thing he has done since.
C. In the early 1990s, my uncle started studying architecture, and except for two years he spent in the Peace Corps, its' the only thing he has done since.

D. In the early 1990 s, my uncle started studying architecture, and accept for two years he spent in the Peace Corps, its the only thing he has done since.