Answer:
Option a is correct that is 5x=30 will use division property of equality.
Explanation:
We have been given four different equations we need to tell which one could be used to solve by division property:
In Option a:
x can will be solved by division property

5 will divide 30 on right hand side by the transformation rule which is
when multiplication is shifted to the other side of the equation it will be in division on the other side.

Therefore, option a is correct.