Steve wrote the digits 1,2,3,4, and 5 in order repeatedly from left to right, forming a list of 10,000 digits, beginning 123451234512 \ldots. He then erased every third digit from his list (that is, the 3rd, 6th, 9 th, … digits from the left), then erased every fourth digit from the resulting list (that is, the 4 \mathrm{th}, 8 \mathrm{th}, 12 \mathrm{th}, \ldots digits from the left in what remained), and then erased every fifth digit from what remained at that point. What is the sum of the three digits that were then in positions 2019, 2020, and 2021 ?
Answer Choices
A. 7
B. 9
C. 10
D. 11
E. 12