Complex LINQ Group by Query

GroupbyFiltering.cs

var histories =  await (from history in db.Histories
                    group history by history.SurahId
                    into h
                    select h.ToList().Select(x => new MemorizedAyahViewModel()
                    {
                        Id = x.Id,
                        Surah = new SurahViewModel()
                        {
                            Index = x.Surah.Index,
                            Name = x.Surah.Name,
                            AyahCount = x.Surah.AyahCount
                        },
                        TotalSurahMemorized = x.TotalSurahMemorized,
                        TotalMemorized = x.AyahEnd - x.AyahStart + 1,
                        InitiallyMemorized = x.InitiallyMemorized
                    }).ToList()).ToListAsync();

Models.cs

 public class MemorizedAyahViewModel
    {
        public string Id { get; set; }
        public SurahViewModel Surah { get; set; }
        public bool InitiallyMemorized { get; set; }
        public bool TotalSurahMemorized { get; set; }
        public int TotalMemorized { get; set; }
     
    }
    
    public class SurahViewModel
    {       
        public string Name { get; set; }     
        public int Index { get; set; }
        public int AyahCount { get; set; }
    }

What is the type of the variable 'histories' in the above gist?