Which two sentences from the article include CENTRAL ideas of the article?
1. Millions of packages are being mailed for the holidays.
2. Recycling is facing a serious problem just in time for the 2018 holiday season.
3. In some cases, they may get rid of recycling altogether.
4. Online shopping has changed recycling.
1 and 2
2 and 4
3 and 4
1 and 3
