The question tests understanding of how to judge size by area. Wrangell-St. Elias covers a vast expanse—roughly 20,000 square miles (over 13 million acres)—which is far larger than the other parks listed (Denali is about 9,000–10,000 square miles, Katmai around 6,000–7,000, and Yosemite about 1,100). That immense area comes from Alaska’s expansive, rugged terrain, with glaciers, mountains, and vast backcountry that span a huge region. So Wrangell-St. Elias is the largest national park by area.

Henry's law for a dilute solute links the amount of solute in the liquid to how much of it appears in the gas phase at equilibrium, with a proportionality constant that depends on temperature. The law says the partial pressure of the solute in the vapor, p_i, is proportional to its mole fraction in the liquid, x_i, via p_i = H_i x_i, where H_i is Henry's constant. If the system has a total pressure P, the vapor-phase mole fraction is y_i = p_i / P, so you can write y_i = (H_i x_i) / P. This directly ties together the total pressure, the vapor-phase mole fraction, the liquid-phase mole fraction, and Henry's constant. Temperature affects Henry's constant, so the equilibrium relationship changes with temperature as well. Surface tension and molar weight aren’t part of this relationship.

A pump’s job is to add energy to a liquid so it can be moved through a system. It does this by increasing the liquid’s pressure (and thus its hydraulic head) so the fluid can overcome friction losses, elevation changes, and other head losses as it travels through pipes and equipment. The energy from a motor is converted into fluid energy, creating the pressure difference that drives flow. This isn’t about filtering solids, storing energy, or measuring temperature. Filtering would remove particles with a filter, storage involves keeping energy in a tank or reservoir, and measuring temperature uses a sensor. The pump specifically raises the pressure to transport the liquid.

Natural logarithms arise as the inverse of the exponential function with a special base chosen to make calculus neat. that base is e, about 2.718. The reason e is singled out is that the growth rate of e^x matches itself: d/dx e^x = e^x. This leads to a clean derivative for the natural log: d/dx ln x = 1/x. If you used a different base, like 10, the derivative would be 1/(x ln 10), which adds an extra constant and complicates calculations. So the base of natural logarithms is e, not 2, 10, or pi.