In the figure provided below,what type of igneous intrusion is the vertical rock unit shown by letter A? 
Definitions:
Longitudinal Designs
Research studies that track the same subjects over a period of time, allowing for observation of changes and developments.
Sequential
Pertaining to or characterized by a sequence, where one element follows another in a specific order.
Cohort Effect
A phenomenon in which research outcomes are influenced by the characteristics of the cohort being studied, often related to the group's unique social or historical context.
Eras
Distinct periods of time identified by specific characteristics, events, or developments.
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