Which of the following endings are used for -ER/-IR verbs in the imperfect? Identify the imperfect conjugations for
A aba, abas, aba, ábamos, abais, aban
B é, aste, ó, amos, asteis, aron
C ía, ías, ía, ímos, íais, ían
D í, iste, ió, imos, isteis, ieron