Final answer:
The verb perder undergoes the e-ie stem change.
Step-by-step explanation:
The stem change that applies to the verb perder is e-ie. Stem-changing verbs in Spanish undergo a vowel change in the stem of the verb when conjugated. In the case of perder, the e in the stem changes to ie in certain forms of the verb. For example, in the present tense, the conjugation of perder in the yo form is pierdo, where the e changes to ie. Therefore, the correct answer is B. e-ie.
Learn more about Spanish verb conjugation