Topic Sentences

Choose which of the two options is a better topic sentence

Which sentence is most likely the topic sentence of the paragraph?

The best trip my family ever took was to New Orleans, Louisiana. We drove there in two days. I didn't think it would be very interesting, but I was wrong. We saw the Mississippi River, rode a horse carriage in the French Quarter, and visited a cemetery where everyone was buried above the ground. I liked the food best, especially the New Orleans doughnuts called beignets.

First, I made flyers describing my service and prices. Mom and I delivered them to all the houses in our neighborhood. A few days later my neighbors dog was my first customer. The owner thought I did such a nice job that he told all his friends. I've been in business almost a year and I'm so busy. Every Saturday I have about seven dog washing appointments. I hope to save enough money to buy a pet store some day.

What would be a good topic sentence for this paragraph?

Select the best topic sentence for the paragraph.

Johnny has to spend twice as long on his math homework. Sometime he gets the numbers mixed up, and he can't remember the formulas. He has to study and practice a lot to get good grades in math.