Which of these excerpts from the story includes an adverbial phrase set off with a comma? The riots were suppressed, but there were

many burglaries in the suburb...

While the little boy and the pet dog raced

ahead, the husband and wife found

O themselves comparing the possible

effectiveness of each style against its

appearance...

There would be no way out, only a struggle

getting bloodier and bloodier ...

The husband said, Don't worry, my dear,

cats always look before they leap.

While the little boy and the pet dog raced  ahead, the husband and wife found  themselves comparing the possible  effectiveness of each style against its  appearance...  

Explanation:

An adverbial phrase is a phrase or group of words that modifies the verb, adverb, and adjectives in a sentence. And if an adverbial phrase begins any sentence, then it should always be followed by a comma.

Among the given sentences, the second sentence contains an adverbial phrase that is set off with a comma. The adverbial phrase is "while the little boy and the pet dog raced ahead" which is then followed by a comma, separating it from the independent clause of the remaining sentence.

Thus, the correct answer is the second option/ sentence.  

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.

the answer is "a" although apex might say best book of the year.