下列哪一项不属于给出研究背景的句型？
A、In recent years, there has been an increasing interest in nanotechnology.
B、This research is aimed to determine whether this factor has a positive or negative influence in the experiment.
C、Antenna design plays a key role in the field of signal transmission.
A、In recent years, there has been an increasing interest in nanotechnology.
B、This research is aimed to determine whether this factor has a positive or negative influence in the experiment.
C、Antenna design plays a key role in the field of signal transmission.