What is a good method for painting several equal-sized leaves with acrylic colour?

Correct answer: Maintain equal brush pressure and paint load

Repeated shapes are governed by consistency of movement, pressure, brush loading, and stroke direction. Using a similar paint load and equal pressure helps each leaf receive a comparable amount of colour and keeps its size and density uniform. Thus option A is correct. Changing brushes unnecessarily, adding excessive water, or folding the paper does not create consistent painted forms and may reduce control.