It's a conflict of interest. Where on one hand she knows what she should do and on the other there's something that she wants. Since there's the option for own personal gains with the two, it's conflict of interest.
The correct answr is D. The spider scurried under the kitchen cabinet.
"Under" is the preposition here which signifies the logical relationship between two objects, the spider and the kitchen cabinet.
Under signifies how these two objects are connected to each other.