Final answer:
The most reliable source is an article by an economics professor from a reputable university, as it is likely to be well-researched and peer-reviewed, providing a professional analysis of immigration's economic effects. Therefore, the correct option is 2)
Step-by-step explanation:
The most reliable online source among the options provided would be an article written by a professor of economics from an esteemed university analyzing the effects of immigrants on the U.S. economy. This is because university professors typically engage in rigorous research and peer review, and their work is often published by institutions that uphold high standards of academic integrity. The relevance of this source is underscored by the acknowledgement that economists have insights and research to offer on the topic of immigration, particularly on its economic effects such as wage levels and government taxes and spending.
The other sources may have varying degrees of reliability. A chart showing trends in immigration can be helpful to visualise data, but without context, the data can be misleading. The interview with a celebrity provides a personal anecdote that may not be representative of the broader impact of immigration. A persuasive political website may have a bias that colors the presentation of information, rather than providing an objective analysis.