Which statement is true about stem-changing verbs in the preterite?

AOnly -ir stem-changers show a stem-change in the preterite.

BAll stem-changing verbs show a stem-change in the preterite.

CNo stem-changing verbs show a stem-change in the preterite.

DStem-changing verbs in the preterite normally change o —> ue or e —> ie.