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.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

it cools slower in the earth meaning the crystals have more time to form than lava on the surface