💡 Detailed Explanation
The intransitive verb 'あつまる' (to gather / assemble) in its te-form is written as '集まって' (atsumatte). Sentence translation: 'A lot of people are gathering in the station square.' '集' is the correct kanji for 'atsumaru'. '集合' is a compound noun 'shūgō' (gathering), but the verb 'あつまる' is represented by '集まる'. '会' (to meet) and '合' (to match) do not read as 'atsumaru'.