For all positive integers a>1, there are divisors of 2021a that are not divisors of 2021. If there are twelve unshared divisors, including 2021a, which of the following answer choices could be a possible value of a? <spanclass=′latex−bold′>(A)</span>9<spanclass=′latex−bold′>(B)</span>10<spanclass=′latex−bold′>(C)</span>16<spanclass=′latex−bold′>(D)</span>18<spanclass=′latex−bold′>(E)</span>19