Explanation:
The correct answer is option B, "Has reached."

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

Usage:
In this sentence, the action of "reaching on Mars" is being referred to. The action of reaching on Mars started in the past and is still ongoing or has just been completed. Therefore, the present perfect tense is appropriate to use in this context.

Options Analysis:
a) Reached - This is the simple past tense form of the verb "reach." It indicates that the action of reaching on Mars occurred at a specific point in the past and does not convey the ongoing or recently completed nature of the action. Hence, this option is incorrect.
b) Has reached - This is the present perfect tense form of the verb "reach." It correctly indicates that the action of reaching on Mars started in the past and is still ongoing or has just been completed. Therefore, this option is the correct answer.
c) Is reaching - This is the present continuous tense form of the verb "reach." It indicates that the action of reaching on Mars is happening at the present moment. However, the sentence is referring to the completion of the action rather than its current occurrence. Hence, this option is incorrect.
d) Was reaching - This is the past continuous tense form of the verb "reach." It indicates that the action of reaching on Mars was happening in the past. However, the sentence is referring to the present status of the action rather than its past occurrence. Hence, this option is incorrect.
e) None of these - This option is incorrect as option B is the correct answer.

Therefore, the correct answer is option B, "Has reached."