Markan priority

Question 1

What are the reasons for believing that Mark was composed first?

Answer 1

Shorter Length:
Mark’s Gospel is the shortest of the Synoptic Gospels (Matthew, Mark, and Luke), which makes it more plausible that Matthew and Luke expanded on Mark rather than Mark condensing their material.
Order of Events:
The sequence of events in Mark is often reflected in Matthew and Luke, further supporting the idea that they followed Mark’s structure
Awkward Style:
Mark’s Greek writing style is sometimes considered less polished or sophisticated than that of Matthew and Luke