What Is a Career?

$(1)$ Growing up$,$ I watched my parents go to jobs that paid the bills. $(2)$ My mother worked as a department store cashier and my father as a convenience store clerk. $(3)$ For minimum wage, they cleaned filthy aisles, got yelled at by grouchy customers, and were threatened with being fired if they didn't work the prescribed schedule. $(4)$ For this reason, I always knew that I wanted to support myself by means of a career, not a job. $(5)$ As I looked for careers, I found that being part of the medical community will not only pay the bills but also offer challenging and intellectually stimulating work for fair pay.

The thesis statement of a definition essay states the word or term that will be defined and usually offers a subjective or objective definition that will developed in the body paragraphs that follow. Which sentence from this paragraph contains the thesis statement?

$(4)$ For this reason, I always knew that I wanted to support myself by means of a career, not a job.

$(5)$ As I looked for careers, I found that being part of the medical community will not only pay the bills but also offer challenging and intellectually stimulating work for fair pay.

$(2)$ My mother worked as a department store cashier and my father as a convenience store clerk.