The right answer is:
<h2>Mezcla
</h2>
This instruction is done using the verb <em>mezclar </em>(to mix) in Imperative mode, with the Subject <em>Tú</em> (You) and in present tense:
(Tú) mezcla
Note, the subject <em>Tú </em>(you), is <u>not explicitly in the sentence</u> (and it is not necessary). This is a <u>Tacit Subject.</u>
Therefore, the sentence is:
<h2>Para hacer la masa, <u>mezcla</u> los huevos, la harina y la leche bien!
</h2>
(To make the dough, <u>mix</u> the eggs, flour and milk well!)
The other options are incorrect because:
- (Tú) mezclas: Although is also in present tense and with the subject <em>tú</em> (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 <em>Tú </em>(You).
- Mezcles: Is used in Imperative <u>Negative</u> mode as (Tú) No mezcles (Don’t mix). This does not fit the instructions given.