Examine the four jumbled sentences. Out of the given options, pick the one that gives their correct order.

1. A university in the US studies the brains of dogs.
2. The left part of their brain is used to understand words.
3. The results of the study were very interesting.
4. The study showed that dogs used their brains like the humans.

ACDB

The correct answer is Option (1) - ACDB

The correct order should be:

A. A university in the US studies the brains of dogs. (This sets the scene)

C. The results of the study were very interesting. (This concludes the passage)

D. The study showed that dogs used their brains like humans. (This reveals the key finding)

B. The left part of their brain is used to understand words. (This explains a specific aspect of the finding)

Therefore, the best option is: ACDB