Which of the following triggered the Second Industrial Revolution? NEED ANSWER 45 POINTS!!

a. Entrepreneurs figured out how to extract coal much more efficiently

b. Geologists discovered vast quantities of petroleum in Germany

c. Innovators figured out how to produce steel cheaply

d. Engineers developed a much faster steam engine

Brainliesttt !me : ) describe the conflict and changes in israel:

Who rejected the final compromise effort to stop the session movement?

How did the construction of the erie canal improve transportation in the united states in the 1820s? a. the canal connected the great lakes to the mississippi river. b. the canal connected the great lakes to the ohio river. c. the canal connected the atlantic and pacific oceans. d. the canal connected the great lakes to the atlantic ocean.