The best statement here to build someone's self esteem would be a. I am really proud of you.
This is a positive statement and will help to increase someone's self esteem. All the other statements are negative and hurtful and would decrease someone's self esteem making them feel bad about themselves.
Socialization of children is important because it sets the groundwork for all future socialization.
When you're measuring the pulse and it is WEAK and RAPID, that is known as THREADY.
When you're measuring the pulse and it is STRONG and FULL that is know as BOUNDING.
Thready and bounding are just synonyms for strong and weak.