Sarah asks the respondents in a research study a series of open-ended questions about the respondents' feelings and thoughts on the subject of child labor. sarah is conducting research.

Qualitative research

Explanation:

Qualitative research  -

It the method of research or brief understanding of any social activity within the natural setting , is known as qualitative research .

In this method , the center point of research is the reason for the social activity , and take the help of experimental data of the day - to - day activities .

Societies , culture and individual are the focus point of this method .

The knowledge is subjective rather than objective .

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals