Product is the result of multiplication so it would be
A. 40 times d
Answer:
Prior to the Civil War the economies of the North and the South developed differently in the early 1800s. Although both economies were mostly agricultural, the North began to develop more industry and commerce. ... The growth of industry in the North helped lead to the rapid growth of Northern cities.
<span>The answer is C-The soil became too salty for crops to grow.</span>
