Answer:
The spanish verb ser (To be) is conjugated in present tense as follows:
1st person singular Yo (I): soy
2nd person singular (informal) Tú (You): eres
2nd person singular (formal) Usted (You): es
3rd person singular Él/Ella/eso/esa (He/She/It): es
1st person plural Nosotros (We): somos
2nd person plural Ustedes (You) (In latinAmerica): son
2nd person plural Vosotros (You) (In Spain): sois
3rd person plural Ellos/Ellas (They): son
Hence, the correct sentence is:
Ana es diseñadora.
(Ana is a designer)
Ana is substituted by the personal pronoun ella (she), and according to the conjugation listed above, the correct form of the verb ser in present tense for this pronoun is es.
The other sentences are incorrect because:
-El ingeniero son inteligente
El ingeniero is substituted by él (he) and the right conjugation is es
El ingeniero es inteligente (The engineer is smart)
-El programador ser mexicano.
El programador is substituted by él (he) and the right conjugation is es
El programador es mexicano (The programmer is Mexican)
-Ella eres alta.
The right conjugation for ella (she) is es
Ella es alta (She is tall)
