After the first day of fighting at Gettysburg, the arrival of reinforcements allowed ✖ the Union to avoid more casualties.

✔ the Union to hold the line and win.

✖ the Confederacy to break the lines.

✖ the Confederacy time to regroup.

In conclusion, the answer is B.

(I am doing this for the people that come across this question and didn't know the answer.)

{hope this helped}
btw this is a question in the unit test review for grade 7 in the semester a for unit 4.

Kate is 14 years old and just started taking dance classes with her friends at a local dance studio. this is her first time in a dance program, so everything is new to her. her friends convinced her to join the class since they have been enjoying it for a few months. how could the following terms her succeed in the dance class? ● secondary reinforcement ● identity vs. role confusion ● observational learning how could the following terms hinder her success in the class? ● circadian rhythm ● basal ganglia ● vestibular sense