ANSWER:
A plank in a party platform is a declaration that addresses a specific issue.
Step-by-step explanation:
Any political party has a set of rules, principles, strategies and goals that address the important political issues. These are called platforms.
The platforms are divided into planks where each plank addresses one specific issue. Planks enable the political parties to focus on the important issues and also provide a clear picture to the voters as to what is the real motive of the political party.