Answer:
Doug wrote geometric sequence.
Step-by-step explanation:
a geometric sequence is where we get common ratio between consecutive terms

In case of Andre:
On substituting the values so as to find common ratio is



Andre did not write a geometric sequence.
In case of Brenda:
On substituting the values so as to find common ratio is



Brenda did not write a geometric sequence.
In case of Camille
On substituting the values so as to find common ratio is



Camille did not write a geometric sequence.
In case of Doug:
On substituting the values so as to find common ratio is



Doug wrote a geometric sequence.