The correct answer is D. Drafting a letter is a skill which you can acquire with a lot of practice.
Option A is incorrect because it uses the past tense “acquired.” This implies that the skill of drafting a letter is something that has already been learned, which is not the case.
Option B is incorrect because it uses the future tense “will acquire.” This implies that the skill of drafting a letter is something that will be learned in the future, which is also not the case.
Option C is incorrect because it uses the modal verb “could.” This implies that the skill of drafting a letter is something that is possible to learn, but not necessarily something that will be learned.
Option D is the correct answer because it uses the modal verb “can.” This implies that the skill of drafting a letter is something that is possible to learn and that the speaker believes that the listener will be able to learn it.
In addition to being the correct answer, option D is also the most concise and clear option. The other options are either too wordy or they do not clearly state the main point, which is that drafting a letter is a skill that can be learned with practice.