This excerpt shows that while Martin Luther King Jr and Gandhi are two of the most widely known civil protesters they are not the first nor the most important.
The error in the possessive construction is that, instead of passenger's, it should be "passengers'". The apostrophe should be after the letter "s" because the noun is in the plural form. The correct sentence would be "Passengers' concerns about cell phone use on planes are justified."
Hi, you need to explain it more because no one knows what you are talking about! So I suggest you say the question again the right way!
