Question #N698

The study shows that certain kinds of insects are often found in the soil. The researcher’s work suggests that these insects are beneficial to the environment and that it’s important to conserve them. However, the researcher’s work does not mean that all insects are beneficial, and some may even be harmful to certain plants and animals in the environment. 

Which choice best combines the sentences at the underlined portion in a way that conforms to the conventions of Standard English?
A. the researcher’s work suggests that these insects are beneficial, however, the researcher’s work does not mean that all insects are beneficial, and some may even be harmful to certain plants and animals in the environment.
B. the researcher’s work suggests that these insects are beneficial, but the researcher’s work does not mean that all insects are beneficial, and some may even be harmful to certain plants and animals in the environment.
C. the researcher’s work suggests that these insects are beneficial; however, the researcher’s work does not mean that all insects are beneficial, and some may even be harmful to certain plants and animals in the environment.
D. the researcher’s work suggests that these insects are beneficial, and the researcher’s work does not mean that all insects are beneficial, and some may even be harmful to certain plants and animals in the environment.