Timothy buys three blocks of stock on April $15$th of each year with his tax refunds for TY$2018-$TY$2020.$ He realizes that he will owe for TY$2021$ and changes tact, selling all three of the blocks of stock off on April $15$th of $2021.$ Which of the blocks will be treated as long$-$term capital gains income for the TY$2021$ return?

The blocks from TY$2018$ and TY$2019.$

The block from TY$2018$ only.

All three blocks.

None of the blocks.