The dataset shown is a classic ''wide'' format'':

A single row per state

Separate columns for each year: 2019, 2020, 2021, 2022, 2023, 2024

Tableau's documentation on data structure and pivoting explains:

Why A is TRUE

Tableau documentation identifies wide datasets (multiple columns representing categories such as years, months, or similar time periods) as high-maintenance structures because:

For every new year, a new column must be added.

Metadata and calculations must be updated each time.

This type of structure is described as having poor scalability and higher maintenance.

This dataset fits that exact description, so A is correct.

Why C is TRUE

According to Tableau's ''Pivot Data from Columns to Rows'' section:

Wide datasets can and should often be pivoted so that repeated columns (such as year columns) become rows.

Pivoting enables dynamic capabilities such as:

Year filters (year selector)

Time-series analysis

Consistent aggregations

Simplified calculations

Pivoting this dataset would produce:

State

Year

Value

Alabama

2019

2300.39

Alabama

2020

3030.39

...

...

...

This makes the dataset tall and tidy, which Tableau identifies as better for analysis and dashboard interactivity.

Therefore, C is correct.

Why B is FALSE

The column names (2019, 2020, 2021...) are simply numbers.

Tableau documentation stresses that good metadata includes descriptive column names.

These column names:

Do not indicate what the measure represents (Revenue? Sales? Population?)

Only show the year, not the meaning of the metric

Thus they are not considered accurate or descriptive column names.

Why D is FALSE

The dataset is already denormalized, not normalized.

Denormalized data means combining multiple attributes (like multiple years) into one table, which is exactly what this dataset already does.

Tableau documentation explains that wide data is already denormalized, and the recommended fix is pivoting, not further denormalization.

Therefore, D is incorrect.