<span>C. people fear taking risks.</span>
Harsh and extremely cold winter was the main geographical factor that added to German losses at Stalingrad.
Russia is well-known for its cold winters and many people from Western Europe even nowadays complain about severe weather conditions while visiting this country. Thus, this is not surprising, that cold weather became a serious obstacle on the way of Germans.
Ending slavery means it will stop for sure, mean while ending the slavery trade means you won't be making more trades but slavery still exist.
Hope this helps! :)
Only representatives can introduce bills in the House of Representatives. Ideas can come from representatives or citizens. Once the bill is "introduced" then a clerk (bill clerk) will give it a number and then another clerk (reading clerk) will read the bill(s) to the representatives. Then the bill goes to a standing committee ( a committee in the House or Senate that will consider bills in a certain subject area).