_is an example of aggressive driving.
a. getting out of the car to physically harm another driver
b. erratic and sudden lane changes
c. trying to cause harm or kill another driver because of something that happened on the road
d. deliberately

Erratic and sudden lane changes are an example of aggressive driving.

Option B

Explanation:

Most of the accidents that happen these days are result of aggressive driving. People often, because of their mood or inability to handle stress or due to heavy traffic congestion resort to aggressive driving.

Some of the common examples are erratic & sudden change of lanes, driving at very high speed which is beyond the permissive limits or not giving any signals while driving. All this can lead to accidents and road rage and in many situations have proved to be fatal.

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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