In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom or phrase “All agog”.

Introduction / Context:
This question tests your understanding of English idioms. Idioms are fixed expressions whose meanings cannot always be guessed from the individual words. The phrase all agog is used to describe a mental or emotional state. To answer correctly, you need to select the option that best captures this overall meaning rather than translating each word literally.

Given Data / Assumptions:
- Idiom: All agog. - Options: Avoid, Contentment, Amazed, Unsystematically. - The correct option should reflect the emotional state denoted by the idiom.

Concept / Approach:
All agog traditionally means very eager, excited, full of curiosity or expectation. When people are all agog, they are intensely interested in something that is about to happen or that they are hearing for the first time. This emotional state includes wonder and excitement, which is close in spirit to being amazed or thrilled. Words that suggest calm satisfaction, avoidance or lack of order do not match this meaning.

Step-by-Step Solution:
Step 1: Recall that all agog describes someone who is highly excited, full of curiosity or bursting with interest. Step 2: Examine Avoid. Avoid is a verb meaning to keep away from something. It does not describe a state of excitement or curiosity. Step 3: Examine Contentment. Contentment is a calm feeling of satisfaction and peace, not a feeling of excited interest. Step 4: Examine Amazed. Amazed describes a state of great surprise, wonder or admiration, which is close to being very excited or eager. Step 5: Examine Unsystematically. This describes doing things without order or system. It has nothing to do with eagerness or astonishment.

Verification / Alternative check:
Imagine typical situations where the idiom is used. We can say The children were all agog to hear the story, meaning they were very excited and full of eager curiosity. Replacing all agog with amazed in such sentences gives The children were amazed to hear the story, which still expresses strong emotional reaction. Using avoid, contentment or unsystematically in that position would not make sense. Therefore, among the given choices, amazed is the best match in meaning.

Why Other Options Are Wrong:
Avoid is wrong because it refers to staying away from something, the opposite of the interest implied by all agog. Contentment is wrong because it suggests calm satisfaction, not the heightened excitement of all agog. Unsystematically is wrong because it refers to a method of doing work, not to an emotional state.

Common Pitfalls:
Students who have not seen this idiom before may try to guess from the individual word agog and may mistake it for something related to confusion or disorder. However, idioms must be learned as whole expressions. A good strategy is to create mental or written notes of idioms with short explanations, for example all agog equals very excited and eager. Regular reading of stories, novels and editorials where such idioms appear will slowly build your familiarity and prevent guessing errors.

Final Answer:
The idiom “All agog” is best explained by the word Amazed, in the sense of being full of excited wonder or eager curiosity.