An experiment is conducted to determine Planck's constant \(h\). Electrons are accelerated to various speeds, and their de Broglie wavelength \(\lambda\) and linear momentum \(p\) are measured. A graph is constructed with \(\lambda\) on the vertical axis and \(\dfrac{1}{p}\) on the horizontal axis. Which of the following best describes the line of best fit for the data and explains how Planck's constant \(h\) can be determined from the graph?