Explanation:

The correct answer is "have ridden" because it is an example of the present perfect tense.

Present Perfect Tense:
The present perfect tense is used to describe an action that started in the past and is still ongoing or has just been completed. It is formed by using the auxiliary verb "have" or "has" followed by the past participle of the main verb.

Subject-Verb Agreement:
In this sentence, the subject is "I" and the verb is "ride." To ensure subject-verb agreement, we need to conjugate the verb correctly based on the subject. Since the subject is "I," the correct verb form is "have ridden."

Past Participle:
The past participle of the verb "ride" is "ridden." Regular verbs form the past participle by adding "-ed" to the base form of the verb. However, "ride" is an irregular verb, so its past participle is formed differently.

Usage of "Have Ridden":
In the sentence, "I have ridden three kilometers to get to work," the action of riding three kilometers started in the past and is still ongoing or has just been completed. The present perfect tense is used to convey this meaning.

Additional Information:
The present perfect tense is often used to talk about experiences, actions that have a connection to the present, or actions that have a result in the present. It is commonly used with time expressions such as "already," "yet," "just," "recently," and "since."

Example: "I have already ridden three kilometers today."

In this example, the speaker is emphasizing that they have already completed the action of riding three kilometers earlier in the day.