According to Research Findings, How Does a Jury Tend to React

According to research findings, how does a jury tend to react to multiple charges?

A) They are more likely to convict a defendant on a charge when it is combined with another charge rather than when it is tried alone.
B) They are equally likely to convict a defendant on a charge when it is combined with another charge as compared to when it is tried alone.
C) They are less likely to convict a defendant on a charge when it is combined with another charge rather than when it is tried alone.
D) Researchers have found that any of the above could be true; it depends on the type of charges.