What are three tips to writing a good headline? this is for journalism

1. Ensure your headline aligns your content
2. Hint at something interesting
3. Keep it simple

Well, the first thing is that it has to be natural. You don't want to write an Article Heading that sounds like you tried too hard. If you truly understand what the article is about you have to make it natural. 
Secondly, it has to catch the readers attention without giving away too much of the article. You want readers to actually read the article not just read the title and be done, so to simplify I'm saying make the Heading simple.
Finally, ensure that there is enough evidence in your first paragraph so the Heading is not an exaggerated fallacy.

I hope this helps! Please PM or comment if you need specified help.

C) not possible and which is rival in consumption.

Answer(d) it has many buyers and many sellers and no single buyer or seller can influence the price;