Which word pair best completes this dialogue? —hola, señor. ¿qué ud. de plato principal? —quisiera el arroz con pollo, a. quisiera; de nada b. pedir; de nada c. desea; por favor d. cuenta; por favor

The correct answer is: C.

Explanation:

This would look like this:

-Hola señor, ¿Qué desea usted de plato principal?

-Quisiera el arroz con pollo, por favor.

In Spanish, the 3rd person (singular and plural) of the present subjunctive is used to form the formal mandates.

In informal mandates, the 3rd person singular of the present indicative is used to form the affirmative mandates and the 2nd person (you) of the present subjunctive to form the negative mandates.

In the example of the formal mandate:

AFFIRMATIVE: ¡Hable!

NEGATIVE: ¡No hable!

In the example of the informal mandate:  

AFFIRMATIVE: ¡Habla!  

NEGATIVE: ¡No hables!