Final answer:
The appropriate form of the verb leer that fills in the blank in the sentence is Léanlo, option A.
Step-by-step explanation:
The appropriate form of the verb leer that fills in the blank in the sentence “No entiendo este artículo. _______ juntos.” is Léanlo, option A. This form is used when addressing a group of people to read something together. The option B Leámoslo is incorrect because it's the form used when addressing a group of people including oneself to read something together. Option C Léalo and option D Léelo are both incorrect because they refer to the singular form, not the plural form.
Learn more about Verb conjugation in Spanish