English grammar error-spotting (preposition with ‘‘awake’’—‘‘awake to’’ not ‘‘awake in’’): Find the single erroneous segment among A–D; choose ‘‘No error’’ only if none is wrong. Focus on idiomatic preposition after ‘‘awake’’: ‘‘Locke's treatises on government toleration and education / show a mind fully awake in / the possibilities of social reconstruction. / No error.’’

Given data

• B: ‘‘show a mind fully awake in’’

Concept / ApproachThe idiom is ‘‘awake to’’ meaning ‘‘alert to; aware of’’. ‘‘Awake in’’ miscollocates the preposition.

Correction‘‘… show a mind fully awake to the possibilities of social reconstruction.’’

VerificationThe sentence now reads naturally and preserves the intended meaning of intellectual alertness.

Common pitfalls

• Using ‘‘in’’ by analogy with ‘‘interested in’’—different verb, different pattern.

Final Answershow a mind fully awake in