Question

occluded front: when a cold front catches up to a warm front separates moist air mass from a dry air mass dry line: separates moist air mass from a dry air mass a front that is not moving

Explanation:

For "Dry Line": A dry line is a boundary that separates moist air mass from a dry air mass. So the correct option is the one with "Separates moist air mass from a dry air mass".
For "Occluded Front": An occluded front forms when a cold front catches up to a warm front. So the correct option is the one with "When a cold front catches up to a warm front".

Answer:

Dry Line: The option with "Separates moist air mass from a dry air mass"
Occluded Front: The option with "When a cold front catches up to a warm front"