Which replacement for the boldfaced sentence is best?
the rangers put out the forest fire that was burning quickly. it took them only a few minutes.

a) the rangers put out the forest fire that was quickly burning.
b) the rangers put out the forest fire that quickly was burning.
c) the rangers put out the forest fire that was burning quickly.
d) the rangers quickly put out the forest fire

The correct option is D)  The rangers quickly put out the forest fire

Explanation:

The statement D, ' the rangers quickly put out the forest fire' best describes the statements 'The rangers put out the forest fire that was burning quickly. It took them only a few minutes.'

Statement D tends to be short and more accurate to describe the scenario mentioned in the question. Hence, it can be considered to be the best replacement which is short and accurate.

c.more precipitation,but only when emission levels.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.