Lacking in interest or flavor.

• A. intransigent
• B. insipid
• C. innocuous
• D. implacable

Answer: (B)

The idea being tested is vocabulary around dullness or blandness. Insipid exactly captures both senses: something with little flavor and something that feels uninteresting or lifeless. That makes it the best fit for “Lacking in interest or flavor,” since it directly conveys both lack of taste and lack of engaging quality.

The other words don’t match as well. Intransigent refers to being stubborn or unwilling to change one’s mind, which has nothing to do with flavor or interest. Implacable means relentless or impossible to appease, again unrelated to dullness or tastelessness. Innocuous means harmless or safe, which can imply blandness in some contexts, but it doesn’t inherently convey a lack of interest or flavor in the sense described here.