You are presented with the question "In what way does a catalyst help in chemical reactions?" and the following answer choices: 
- Generating heat
 - lowered energy cost
 - metabolic reaction
 - heating liquids
 - by making heat
 - adding heat
 - increases a body's strength
 - preventing heat transfer

Now knowing that all chemical reactions require activation energy to get started and catalysts lower the activation energy, choose the best answer.


 

  lowered energy cost       