Answer: Option A) is the energy required for molecules to react with each other
Explanation:
Since each molecule partaking in a reaction possess intramolecular bonds (within their atoms) holding them together; for reaction to occur, an equal or higher energy is required to break through the intramolecular bonds and propel reacting molecules to combine and form products.
This required energy is called ACTIVATION ENERGY, and it is often lowered by catalysts
