Which verb best completes this instruction from a parent to a child? para hacer la masa, los huevos, la harina y la leche bien! mezclas mezclo mezcles mezcla

The right answer is:

This instruction is done using the verb mezclar (to mix) in Imperative mode, with the Subject Tú (You) and in present tense:

(Tú) mezcla  

Note, the subject Tú (you), is not explicitly in the sentence (and it is not necessary). This is a Tacit Subject.

Therefore, the sentence is:

(To make the dough, mix the eggs, flour and milk well!)

The other options are incorrect because:

- (Tú) mezclas: Although is also in present tense and with the subject tú (you), is in indicative mode, not in imperative mode.

- (Yo) mezclo: Although is in present tense (indicative), it is not in accordance with the subject Tú (You).

- Mezcles: Is used in Imperative Negative mode as (Tú) No mezcles (Don’t mix). This does not fit the instructions given.