Institution: Bangladesh Public Service Commission (BPSC) Exam: 17th BCS Preliminary Exam 1996
Topic: Idioms & Phrases, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The term "blockbuster" originally referred to a powerful type of bomb used during World War II, capable of demolishing buildings. These bombs were designed to create significant destruction over a wide area, capable of taking down entire structures in a single explosion. The name “blockbuster” derives from the ability of these explosives to “bust” through blocks of buildings.

In modern usage, the term has evolved to describe films or events that achieve immense popularity and commercial success, paralleling the concept of powerful explosives that can create a large impact. However, its roots firmly lie in the definition related to explosives. Therefore, option D, “A powerful explosive to demolish buildings,” is the correct interpretation of the term "blockbuster."

Options A, B, and C do not accurately reflect the established meaning of "blockbuster," as they relate to physical objects or concepts that do not capture the dynamic and impactful nature associated with the term's explosive origins.