The total grain output in 1995 more than quadrupled the 1949 figure, or an average increase of 3.1% a year.
B.
The total grain output in 1995 more than quadrupled, comparing the 1949 figure, or an average increase of 3.1% a year.
C.
The total grain output in 1995 more than quadrupled 1949, compared with its output figure, or an average increase of 3.1% a year.
D.
1995 and 1949 were in comparison that the former quadrupled the latter in terms of the total grain output figure, or an average increase of 3.1% a year.