The following building blocks are not available in the building blocks grouping:
1.calendar
2.page parts
3.advertisements
4.picture placeholders

Option 4) Picture placeholders

Explanation:

Below are the three building block galleries: - 

Calendars: - The calendars gallery is used to insert monthly pre-formatted calendars into a publication. The current or coming month calendar can be selected from the gallery or a month and a year from the gallery in the Library Building Block can be selected.

Page Parts: - The page parts gallery is used to insert structural elements in a publication that are preformatted. These items include titles, pull quotes, sidebars, and articles.

Advertisements: - The advertisements gallery is used for inserting in a publication pre-formatted advertising elements. These elements include ads, payloads, and coupons.

The picture placeholders are not available in the building blocks grouping. 

Picture Placeholders: - A placeholder image is a dummy photo designed to show the need for an actual picture.Below are the three building block galleries: - 

the answer is a   : ) hope that

i think the answer is a or d