Afreshwater stream flows into the ocean. which statement correctly describes how the stream affects the salinity of the ocean?

1) salinity increases because the stream adds salt to the ocean.

2) salinity decreases because the stream adds freshwater to the ocean.

3) salinity increases because the stream adds freshwater to the ocean.

4) salinity remains the same because the steam adds freshwater to the ocean.

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.