The correct spelling is d) self-esteem.
In APA style, it’s important to use correct spelling, especially for terms that are commonly used in academic writing. ‘Self-esteem’ is the established term, which refers to an individual’s overall subjective emotional evaluation of their own worth. The hyphenation is crucial as it distinguishes it from the two separate words ‘self’ and ‘esteem’, which could create confusion in context. The other options, such as ‘posttest’, ‘non immigrant’, and ‘selfscoring’, are either misspelled or not standard terms in the context of APA writing guidelines.