1. You would call a bus a guagua in C. Cuba.
In Spanish, the word guagua means a bucket, however, in colloquial everyday speech, the Cubans also refer a bus as a guagua. The word is not that new, actually, as it has been used with this meaning since the 19th century in Cuba.
2. The correct answer is A. paella.
Paella is a Spanish dish consisting of rice, veggies, meat, and spices. It originates from the Spanish city of Valencia, where it was first created in the 19th century. It is considered to be one of Spain's national dishes, which is now popular all over the world.
3. This difference comes from the fact that the Earth is constantly revolving around the Sun, which means that at every time in a year, one side of our planet is going to face the Sun, which is why that side will experience summer months, whereas the other part, which is not facing the Sun will experience winter months until the Earth spins the other way.