Answer:
Laura: ¿Puedes jugar al ajedrez conmigo? Eva: No, yo estoy estudiando
Step-by-step explanation:
Eva's answer must be on a the first person singular, since she uses the pronoun yo. Also, the answer must on present progressive tense, since she is currently studying while Laura wants to play chess. When using present progressive both the verb "estar" and the verb used must match the noun. Therefore the correct form is "estoy estudiando"