One feature of a two-way immersion program is that it promotes:

The correct answer, which indicates that a two-way immersion program promotes additive bilingualism, is significant because it highlights the program's goal of supporting both the minority and majority language speakers. Additive bilingualism refers to the process where a second language is learned without losing the first language. In a two-way immersion program, students are exposed to both languages, enhancing their proficiency in both and benefiting cognitively, socially, and academically.

This model contrasts with subtractive bilingualism, where learning a second language may result in a loss of the first language. Sheltered content instruction focuses on providing support for English learners in academic subjects while they acquire English proficiency, but it does not inherently aim to develop bilingualism in both languages. Immersion in English, although beneficial in other contexts, does not represent the dual-language focus in a two-way immersion setup, which intentionally promotes bilingualism in all participants.