Quickly! ill mark you brainliest, rate u a 5 and you!

for numbers 4 and 5, choose the answer that correctly combines each pair of simple sentences into a compound sentence.

4. world war ii began. richmond joined the army.

a. world war ii began but richmond joined the army.

b. world war ii began, richmond joined the army.

c. world war ii began, and, richmond joined the army.

d. world war ii began, and richmond joined the army.

5. with the men away, many jobs were open to women. lucy became a librarian.

a. with the men away, many jobs were open to women, so lucy became a librarian.

b. with the men away, many jobs were open to women, lucy became a librarian.

c. with the men away, many jobs were open to women, so, lucy became a librarian.

d. with the men away, many jobs were open to women so, lucy became a librarian.