Which is the correct subject pronoun to use when speaking to a group of people in the following sentence? _you_ (all) are doing very well in spanish.

a. yo

b. ellos

c. nosotros

d. ustedes

Choose the term that best fits the description below of a severe weather condition. éste fenómeno en una acumulación de aire y agua de forma cónica que rota violentamente en su propio ojo. a. un huracán b. un tornado c. una tormenta d. un ciclón tropical