Final answer:
The verbs 'ser' and 'estar' both mean 'to be,' but 'ser' is used for permanent states, while 'estar' is used for temporary states, which is essential for verb tense consistency in Spanish. Correct answer is B.
Step-by-step explanation:
The difference between the verbs ser and estar, both meaning "to be," is based on the type of state they describe. Ser is generally used to express permanent or lasting attributes, such as inherent characteristics, time, and possession.
On the other hand, estar is used to express temporary states or conditions, such as emotions, physical locations, or actions that are taking place. These patterns are important for maintaining verb tense consistency and clarity in communication.