Select the most appropriate option to fill in the blank.
The Great wall of China was built to link existing fortifications into a united __________ system and to keep the invading Mongol tribes out of China.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. defence.
Let’s look at the sentence:
The Great Wall of China was built to link existing fortifications into a united ______ system and to keep the invading Mongol tribes out of China.
- The second part clearly mentions 'to keep the invading Mongol tribes out', which means the purpose was protection or security.
- So, the word that logically and meaningfully fits is 'defence'.
Irrigation – related to water supply for agriculture; not relevant to walls or protection.
Ecological – related to the environment or ecosystems; not suitable here.
Corporate – related to businesses or companies; unrelated to ancient fortifications.
Defence – relates to protection from attack or danger.