Select the number of the punctuation error. The lobbyists1 spent a great deal of time, effort,2 and money in educating the legislators about the problems of the aged,3 therefore,4 the bill passed without difficulty.

2

Explanation:

When listing items in a sentence, you don't need a comma before the "and".

For example:

My favourite fruits are bananas, mangoes, cherries, pineapples and apples.

Hope that helped : )

the author develops a cold, and scared tone. making the reader shudder with fear, and suddenly become cold. i'm guessing that he's writing a scary novel, or maybe about a chilly december night.