Question

what does the structure of the word \altruistic\ tell the reader about its meaning?
the word stem tells the reader that the meaning is related to \believe.\
the word stem tells the reader that the meaning is related to \body.\
the suffix tells the reader that the meaning is related to \having the quality of something.\
the suffix tells the reader that the meaning is related to \the state or condition of something.\

Explanation:

The suffix “-ic” in English often means “having the quality of something”. For example, “poetic” means having the quality of poetry. In the word “altruistic”, the stem “altru-” is related to self - sacrifice or concern for others (from the French “autrui” meaning “other people”), and the suffix “-ic” indicates that it is an adjective having the quality related to altruism.
The stem “altru-” has no relation to “believe” (which might be related to stems like “cred -” as in “credible”) or “body” (related to stems like “corp -” as in “corporal”). The suffix “-ic” is not for “the state or condition of something” (suffixes like “-ness” or “-tion” are more for that, e.g., “happiness” or “education”).

Answer:

The suffix tells the reader that the meaning is related to "having the quality of something."