问题
To our disappointment, the research they have carried out has been limited ____ production profits, ______ making sure that GM foods are safe.
A:to increase, instead of
B:to increasing, as well as
C:to increase, other than
D:to increasing, rather than
B:to increasing, as well as
C:to increase, other than
D:to increasing, rather than
正确答案是：
