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.

The union to hold the line and win

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.

explanation:

may i ask what challenges?