I need help with all these questions please

Aresearcher is making an argument that the increase in nuclear weapons led to distrust between americans and soviet citizens

Sailors went to special school to learn how to use the new technology that would them sail far distences. the school we know about was

"six months ago, several of molly's friends joined the trimtime fitness center. each of them participated in trimtime's weight-reduction and fitness regimen. all reported substantial weight reduction, and all are visibly slimmer. molly is convinced. she joins trimtime and enrolls in the program, hoping and expecting to see the same results. she is especially delighted to learn that trimtime had adjusted its program to make it even more effective in a shorter period of time." what is the feature in question/attribute of interest in this argument?