Sentence B. My mother "emigrated" from China and came to the United States uses the underlined word correctly. <u>Emigrate</u> means to leave one country to settle in another, and it implies a permanent move. On the other hand, <u>immigrate</u> is to enter and settle in a foreign country. The difference between these two words is that emigrate is the act of leaving a country and immigrate the act of entering a country.
You need to give us more description.
Tear is to sorrow as smile is to <u>joy</u> or <u>happiness</u>.
To tear usually means to be sad, or have sorrow. Smiling is an expression of happiness or joy.
Hope this helped :) <-- Joy :P