Geometry

Question Analysis:
This question tests the application of the midpoint formula to a parallelogram's diagonal.
The main focus is on accurate calculation.

Key Concept Explanation:
Midpoint formula: ((x₁ + x₂)/2, (y₁ + y₂)/2).
In parallelograms, diagonals bisect each other.

Step-by-Step Solution:
Identify diagonal endpoints:
A(1, 2), C(6, 6)
Midpoint = ((1 + 6)/2, (2 + 6)/2) = (3.5, 4)

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