The question is not which form but if you actually owe the resulting self-employment tax.
SE tax comes from C form earnings. It is about 15% after you take all your deductions. Maybe a few hundreds bucks is not worth bothering with for you.
For me, it is. Always. So I go the extra mile to keep George Bush poor.
If you were not actually in business as a self-employed data entry worker, you might not owe any SE tax and you can report the income on the face of the 1040 as "other income".
IRS lost a case on this point, cited as Batok v. Commissioner. Your tax issue, like Batok, may come down to whether your income was irregular and rose to the level of a business enterprise.
Mr. Batok put in some windows at an office building. The business paid him, deducted the expense and sent him a 1099. The special judge ruled that Batok was not self-employed, even though he got a 1099, was not required to file a form C of any kind, and was not subject to SE tax.
People, such as my fellow posters, might not have fought the IRS using this rationale. They may think you should pay more tax. So what? The cite is Batok and lays out the complete basis that might help you. That is if a few hundred of your dollars are worth your effort.
If after reading Batok, you may discover you likely were self-employed. For example, you got a business license or you had cards made for your business. Then, you get a regular form C and write down every deduction to reduce the amount of SE tax.
BTW, never use any EZ or short forms. You may lose rights to amend your returns and may lose refunds or other goodies that Mr. Bush wants you to have.
Now be a good sot and give your uncle Eric his 10 points.