Flakes of brick are they mechanical or chemical and what is a description of location

B. to study the spatial patterning of forests and forests fires and plan for better use of fire fighting resources in the u.s.

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).

Why you put last one a? i think is b.