'All the books written by Professor Bhardwaj are textbooks. Some of his books are published by India Publishing House.' Which follows?

AIndia Publishing House publishes textbooks only

BSome textbooks written by Professor Bhardwaj are published by publishers other than India Publishing House ✓ Correct

CAll books published by India Publishing House are written by Professor Bhardwaj

DNone of the above

Correct answer: (B) Some textbooks written by Professor Bhardwaj are published by publishers other than India Publishing House

Explanation

It follows that some of Bhardwaj's textbooks are published by publishers other than India Publishing House.

All of his books are textbooks, and only some of them come from India Publishing House.

If only some are from that house, the remaining ones come from elsewhere.

Since every one of his books is a textbook, those remaining ones are textbooks too.

Hence some of his textbooks are published by other publishers.

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