From the given options, identify the tense used in the sentence 'Welcome to the ceremony.'

In the sentence 'Welcome to the ceremony,' the base form of the verb ('welcome') is used, which is characteristic of the Simple Present Tense. This tense describes an action happening in the present moment.

Options A and B (Past Tenses) are incorrect because the verb is not in a past tense form (e.g., 'welcomed').

Option D (Present Perfect Tense) is incorrect because the sentence lacks the required structure of 'have/has + past participle' (e.g., 'have welcomed').