Final answer:
Thunderstorms are more common along a cold front due to the rapid upward movement of warm air that happens when the colder air mass pushes underneath, hence the statement is true.
Step-by-step explanation:
Thunderstorms are indeed more common along a cold front, which is an area where a colder air mass is replacing a warmer air mass. The cold air pushes under the warmer air, causing the warm air to rise rapidly. This can result in the formation of strong thunderstorms as the upward movement of warm, moist air generates condensation and cloud formation, releasing energy in the form of thunderstorms. Therefore, the statement that thunderstorms are most common along a cold front is true.