Question

the police union regards the move as an insult that ______ officers could not guarantee security in the greek capital. source: bbc
archives
refrains
schemes
implies

Explanation:

"Implies" means to suggest or indicate indirectly. Here, the police union sees the move as an insult that indirectly suggests officers can't guarantee security. The other words - "archives" (records), "refrains" (stops oneself from doing something), "schemes" (secret or devious plans) - don't fit the context.

Answer:

D. implies