In which option have the following jumbled words/phrases been formed into a meaningful and grammatically correct sentence ?
(A) taught to think
(B) a school child
(C) for himself
(D) should be

Correct option is B

The correct sentence is:
"A school child should be taught to think for himself."

This sentence is meaningful and grammatically correct. Here's how:

• (B) A school child → Subject

• (D) should be → Modal + passive helping verb

• (A) taught to think → Passive main verb + infinitive

• (C) for himself → Prepositional phrase indicating independence or self-reliance

All components align with the standard English sentence structure (Subject + Modal + Passive Verb + Infinitive + Object/Complement). Hence, option (b) is the correct answer.