Although your mother had to nag you to clean your room as a child, she always praised your effort when you finished cleaning your room. Her comments likely your intrinsic motivation to maintain a clean and hygienic environment as an adult without being nagged.
A. eliminated
B. decreased
C. increased
D. downgraded

option C

Explanation:

Everyone always wants to be praised for doing a good job. just as my mother has praised me for doing a good cleaning, I would be motivated to always do a good cleaning job in my room because I know my mother will be happy and praise me for it, so it increases motivation to continue it.

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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