Which combination provides the most complete control when painting a series of equal-sized leaves with poster colour?

Correct answer: Use an identical guide shape and control brush load, pressure, and stroke direction

Uniform repetition depends on controlling both the design and the brush action. A guide shape keeps the leaves similar, while a consistent brush load, pressure, and stroke direction keeps their edges and colour coverage even. Therefore option A gives the most complete control. A different brush, changing water amounts, or working without a plan introduces variation rather than reliable repetition.