What are the common problems L2 users encounter when they learn how to write?

It has many problems because writing is not only an art rather the academic and social success of students is based on their proficiency and competency in writing skills.

Explanation:

Students’ problems in writing skills have become a challenging issue for many stakeholders including educational institution, teacher, parents and students themselves. Writing well is not only an art rather the academic and social success of students is based on their proficiency and competency in writing skills. Many students at public sector colleges are unable to produce a single correct paragraph. The present study aims to explore the problems affecting L2 Learners’ English writing skills at Public Sector Colleges Hyderabad Sindh. A total number of 5 teachers for semi structured interview and 160 students were randomly selected for questionnaire data from two public sector colleges. The framework of present study was generated by sequential mixed method model of Creswell (2009). In quantitative phase questionnaire was analyzed using descriptive and inferential statistical tools through SPSS version 20. Whereas, in next phase of qualitative study semi structured interview was analyzed using content analysis technique. Results of the study indicates that the most frequent writing difficulties in English language faced by L2 learners are due to spelling problems, L1 interference, poor vocabulary, L2 Grammar, punctuation, and lack of feedback on written task by L2 Teacher. While, L2 teachers believe that students are facing writing difficulties in English language due to poor academic background of learners, lack of resources in English language classroom, large class issue, insufficient activities in coursebook. The study concludes with the pedagogical implications to develop English writing skills of the students.

the answer is definitely d. sorry for a late response.