1. The right answer is lo comí
We use direct object pronouns to replace a direct object, that is a noun that directly receives the action of a verb in a sentence. Moreover, direct object pronouns in Spanish agree in number and gender with the nouns they replace. So, the sentence we are studying is comí el plátano (I ate the banana). In this way, el is a definite article (male) and plátano is a male noun (singular), so the direct object pronoun that matches this sentence is lo.
2. The right answer is D) petroleum products
Cartagena, a city located in Colombia, a south american country, has its main economic activities in the industry, tourism and commerce. The most important refinery in the country is located in this city having a daily production of 165,000 barrels of oil.
3. The right answer is A) incorporating elements of fantasy and magic into realistic situations
Magic realism was spearheaded by Latin American authors. We can consider this movement as a genre of narrative fiction. This means that magic realism includes the magic or supernatural in a real world story. One of the principal authors in this area was Gabriel Garcia Marquez and his principal works were One Hundred Years Of Solitude and Love In The Time Of Cholera
4. The right answer is D) Sí, los compré
The question ¿Compraste los huevos? means ¿Did you buy the eggs? So, in this question we have that los is a masculine definite article given in the plural form and huevos is a masculine noun as well. Therefore, the direct object has to match both the gender and number. So, the direct object pronoun we must use is los
5. The right answer is C) la leche
The sentence la bebí yo (I drank it) includes the direct object la, that is feminine and singular. So, the noun must be feminine as well as the definite article. Moreover, those ones must be given in singular form. So, in the sentence la leche, the definite article la is feminine and singular. On the other hand, leche is a feminine noun whose meaning is milk.