Answer:
First-degree murder
Explanation:
First - degree murder -
It is considered to be the most serious form of crime .
This includes the method of intentional killing and planning and plotting before hand to kill the person .
Similarly as given in the question , Ava , tries to kill her brother , as she thought her life would be more easy and happy without him , hence ,
Cleverly planning to murder her brother , when he use to come for jogging in the morning , and shooting him on his back .
Hence , the correct term for her offence is First-degree murder .