Explanation:

“Meticulous” means showing great attention to detail; very careful and precise. Therefore, the set of words that consists of its synonym and antonym is “Scrupulous : Slapdash”. Hence, option (b) is the most suitable answer choice.
Conscientious means wishing to do one's work or duty well and thoroughly.
Nemesis means the inescapable agent of someone's or something's downfall.
Scrupulous means (of a person or process) careful, thorough, and extremely attentive to details.
Slapdash means done too hurriedly and carelessly.
Sloppy means careless and unsystematic; excessively casual.
Subservient means prepared to obey others unquestioningly.