Based on the meanings in Text,
a) “safeguarding” (line 2) and protecting are antonyms.
b) “resigned” (line 4) and reassumed express similar ideas.
c) “snoozing” (line 19) and napping are not equivalent in meaning.
d) “ripe” (line 23) and unprepared are synonyms.
e) “hurdle” (line 26) and barrier are synonyms.