PLEASE HEL! :< Which of the following statements best describes Sarah's investigation?

Get a piggy bank and a hammer.
Place the piggy bank on the counter.
Use the hammer and hit the piggy bank.
Record observations.

Which of the following statement is Sarah's best investigating?

A. Breaking a piggy bank causes a temperature change.
B. Breaking a piggy bank is a chemical change.
C. Breaking a piggy bank is a phase change.
D. Breaking a piggy bank is a physical change.