💡 Detailed Explanation
The correct choice is 'すこし前に' (a short while ago). The adverb 'さっき' (sakki) refers to a point in the very recent past. Sentence translation: 'I met Mr. Tanaka a short while ago.' 'あした' means tomorrow, 'らいしゅう' means next week, and 'あとで' means later on, which are all future-oriented terms.