Read the paragraph.

[1] thomas jefferson was the primary author of the declaration of independence. [2] jefferson began writing in early june of 1776, and he took three weeks to finish the first draft. [3] the delegates of the second continental congress reviewed the document during the last week of june.

which is the best way to revise sentence 2 to improve sentence variety in the paragraph?
in early june 1776, jefferson began writing, and he took three weeks to finish the first draft.
jefferson, who began writing in early june 1776, took three weeks to finish the first draft.
the first draft, which jefferson began writing in early june 1776, took him three weeks.
jefferson took three weeks to finish the first draft, which he began writing in early june 1776.