<u>Answer:</u>
In <u>Spanish </u>grammar the Present Perfect tense is similar to the English grammar, and the rule is as follows:
<h2>Subject + verb <u><em>Haber</em></u> (to have) in present tense + verb in past participle + complement
</h2>
It is used to express that an action took place in the past but continues in the present.
If we want to write a sentence in in Present Perfect tense, we have to follow the rule above, <u>taking into account that the verb </u><u><em>Haber</em></u><u> in present also must be </u><u>correctly written</u><u> according to the </u><u>subject pronoun.</u><u> </u>
As follows:
1st person singular: Yo <u>he</u>
2nd person singular: Tú <u>has</u>
3rd person singular: Él/Ella/eso/esa <u>ha</u>
1st person plural: Nosotros <u>hemos </u>
2nd person plural: Ustedes(In LatinAmerica)/Vosotros(In Spain) <u>han </u>
3rd person plural: Ellos/Ellas <u>han</u>
Therefore, according to the former explanation and the rule described, the right answer is C:
<h2>
Carlos <u>
ha</u>
navegado por el río Tambopata esta mañana.
</h2><h2 /><h3><u>
Carlos</u>
is the <u>Subject</u></h3><h3><u>
ha</u>
is the conjugated form of the <u>
verb Haber in present</u>
with the 3rd person singular</h3><h3 /><h3><u>navegado</u> (sailed) is the <u>main verb</u> of the sentence <u>in past participle</u></h3><h3 /><h3><u>
por el río Tambopata esta mañana</u>
is the <u>
complement</u>
of the sentence</h3><h2 />
In english is:
Carlos has sailed on the Tambopata River this morning.