The important result of the Union victory at Vicksburg was that the Union now controlled the Mississippi River. The correct option among all the options given in the question is option "A". This also helped the Union to cut off most of the Western States from the hands of the Confederate army. Also the Union had the control over the food supplies and this made the Confederate army surrender quickly.
<span>Darley and Latane concluded that the bystander effect is due less to apathy and more to "diffusion of responsibility", which makes people feel unable to respond, often because they feel someone else would be more qualified to help and/or do a better job, and that their help may be unneeded or they may face consequences for botching the help. This is made worse when more people are around.</span>
Answer:
implementing a plan of explanation
