Answer and explanation

Correct answer: D. since

  1. Step 1: 'Since' goes with a point in time such as 2019.
Answer
since.
Why not the others: "during" is wrong because 'during' does not give a starting point. "from" is wrong because 'from' would need 'to' and a past tense. "for" is wrong because 'for' needs a length of time, not a year.

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