5. Which method involves asking the respondents directly and personally?

Personal Interviews:

Personal interviews are one of the most used types of interviews, where the questions are asked personally directly to the respondent. For this, a researcher can have a guide online surveys to take note of the answers.

Explanation:

alone =having no one else present.

no its not a run on sentence however i think you meant wet suits not sours also a run on sentence would be like surfers surf all winter long in southern california by using wet sours to keep them warm and the live their all year long