The appropriate tense to use that follows the question will be A. I have just had lunch.
It should be noted that grammatical tense simply means a category that is used to express reference.
Tenses are usually manifested based on the specific form of verbs that are used in the literary work.
The main tenses that we found in the English Language are the present tense, the past tense, and the future tense. In this situation, the question that was asked by the first person is "Would you like something to eat?"
Therefore, the appropriate answer will be: No thanks, I have just had lunch. This showed that the person has already eaten.
Also, for the second question, the sentence "Tamrat has lost his key" may mean that he is looking for it now.
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