Antonym of BLATANT

Answer: Option B

Blatant : (of bad behaviour) done openly and unashamedly.
Noisy : making or given to making a lot of noise.
Quiet : carried out discreetly, secretly, or with moderation.
Barren : (of land) too poor to produce much or any vegetation.
Slow : moving or operating, or designed to do so, only at a low speed; not quick or fast.

Antonym of Blatant is Quiet