The correct answer is: Either you or I should take the lead.
The verb “take” is used in the present tense in this sentence because it is a general statement about what should happen. The sentence is also in the first person plural, which means that it is referring to two people. Therefore, the correct verb form is “take.”
The other options are incorrect because they are not in the present tense or they are not in the first person plural. The option “takes” is in the third person singular, which would be correct if the sentence were about one person. The option “taking” is the present participle of the verb “take,” which would be correct if the sentence were about an action that is happening right now. The option “took” is the past tense of the verb “take,” which would be correct if the sentence were about something that happened in the past.
In conclusion, the correct answer is: Either you or I should take the lead.