Easy you can't touch the subscripts so u need to add coiffents like a puzzle if you do this then it will chance this 1st name each element on each side then say how much it's worth then see what you need to chance like this
Ti=1
Cl=4
Mg=1.
On the other side
Ti=1
Mg=1
Cl=2. What do you need to change using coffients
because they run out of energy.
EXPLANATION:
when it is transferred and to other objects, or their kinetic energy is converted into gravitational energy.
A catalyst speeds up the rate of reaction so the answer is B.