Which sentence contains the underlined word that pertains to transitioning between different social classes

After 3 days of rest, Alexa was back on her feet and mobile once more.

Jack's father operates the mobile library to reach communities without access to the local library.

Bryce's family relocated from Dayton to Mobile, Alabama.

Ian's generation has been labeled as economically mobile, as people's financial states can change during their lifetimes.

Ian's generation has been labeled as economically mobile, as people's financial states can change during their lifetimes.

The sentence that contains the underlined word that pertains to transitioning between different social classes is: "Ian's generation has been labeled as economically mobile, as people's financial states can change during their lifetimes."

The sentence that contains the underlined word that pertains to transitioning between different social classes is:

"Ian's generation has been labeled as economically mobile, as people's financial states can change during their lifetimes."

To find the sentence, we can look for the word "mobile" and check if it relates to transitioning between different social classes.

In the first sentence, "mobile" refers to being physically mobile, as Alexa is back on her feet and able to move again.

In the second sentence, "mobile" refers to the mobile library being able to reach communities without access to the local library.

In the third sentence, "Mobile" refers to the city in Alabama where Bryce's family relocated to.

Only in the fourth sentence does "mobile" relate to transitioning between different social classes. The phrase "economically mobile" means that people's financial states can change during their lifetimes, indicating a transition or movement between different social classes.