Dutch Mathematical Olympiad

The number $1$ is written on the blackboard. A turn consists of wiping out the number on the board and replacing it by the double of the number, or by the number one smaller. For example, we can replace $1$ by $2$ (the double) or $0$ (one smaller), and if $5$ is on the board, we can replace it by $10$ or $4$. What is the minimum number of turns needed in order to write the number $2021$ on the board? A) $14$ B) $15$ C) $16$ D) $17$ E) $18$