A rigger brush starts a long fine line correctly but the line breaks near the end. Which adjustment is most needed?

Correct answer: Load the brush with enough suitably thinned paint and maintain continuous speed

A rigger brush stores only a limited amount of paint, so a long line can fail when the paint is too thick or the movement becomes uneven. Loading it with sufficiently fluid paint and maintaining a steady continuous speed supports uninterrupted flow; therefore B is correct. Extra end pressure, rough paper, or cutting the tip would reduce control rather than solve the cause.