We all have different kinds of memories. Many are of happiness and joy, some are of sorrow. Some memories we lose, but some are so bright that they are never lost. The memory of my first day at school is still bright in my heart. I was 6 years old then. When my father told me that I would start going to school, I was very excited and nervous. What a place for school, how others would treat me on my first day at school, I wondered. The next morning my mother woke me up in the morning. Wearing new clothes, I started going to school holding my father’s hand. Dad first took me to the school’s headmaster’s room. He smiled and asked my name. Then he called the class teacher and sent me to my class. I was surprised to see children my age filling the room. They embraced me with love, everyone became my friend in a few days. They were my classmates, playmates too. I played a lot on the school field. I still think I can recognize every grain of sand in that field. I will never forget the memory of my first day at school.

Answer:
B) Scientists are learning about life in the sea and how it may improve life on land.
Explanation:
Scientists are learning about life in the sea and how it may improve life on land. ( The study of sea plants and sea animals may help us to learn new ways of finding food). Scientists are searching the ocean floor for oil and gas deposits to help keep our world running smoothly.
Consider the main idea to be a concise but all-encompassing summary. It covers everything mentioned in the paragraph in broad strokes but excludes the specifics. Those details will appear in later sentences or paragraphs, adding nuance and context to the main idea, which will rely on them to support its argument.
In “Fame is a fickle food,” Dickinson illustrates the temporary and unsatisfying nature of fame by comparing it to a fickle food, one that sits on the “shifting plate” of a guest for whom the table is not set a “second time.” The intelligent crow chooses to eat the “Farmer's Corn” rather than the “crumbs” of fame.
I don't know because i don't know what you're trying to ask me?
Sorry :/