Psychologists have concluded that identity is

something that is programmed into our genetic code

always changing based on circumstances and situations

a set of values and ideals as well as a vocational direction

determined by the time an individual reaches puberty

Identity is a fluid concept. It is always changing based on circumstances and situations. Many influences throughout our lives mold and shape and change our identity. Identity is who we are and how we make sense of the world we live in. We all have unique identities and they are constantly changing as we grow and development and experience life.  

when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?

i think the answer would be b.