An advanced-beginner-level EL writes the sentence: "I went to sea a movie." The nonstandard spelling is most likely a result of the learner's current state of interlanguage with regard to

Positive transfer refers to the influence of a learner's native language that aids in learning a new language. In this case, the spelling error "sea" instead of "see" suggests a misunderstanding rather than a helpful transfer, as the learner is incorrectly applying their knowledge rather than correctly using it.

Sequential bilingualism occurs when a person learns a second language after establishing proficiency in their first language. While this can affect language learning, the specific spelling error does not directly relate to the process of acquiring a second language sequentially, but rather to challenges in spelling conventions.

Subject-verb agreement pertains to grammatical rules regarding matching subjects with their corresponding verbs. The spelling error in the example does not relate to grammatical structure but rather to the learner's understanding of spelling, making this choice irrelevant to the issue at hand.