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Answer: Wealthy people have more willpower than poor people
Explanation:
The implied main idea of this reading is that wealthy people have more willpower than poor people.
This can be deduced from the passage that while the children from poorer families were more likely to eat the first marshmallow than wait, due to the fact the future is uncertain, the wealthier children found it easier to hold out, because they believed that their needs will be met.
The provided sentence "My mother she is nice" is incorrect for a few reasons. First of all, the sentence does not end in a period. Second of all, you would not say <em>My kitten she is playful.</em> would you? no, you would not. When speaking in English, you do not place a noun (a person in this case) next to a pronoun since you already have the noun to identify the character with.