Statement I is correct: During the Northern Hemisphere winter (January), isotherms (lines of equal temperature) do not run parallel to latitudes. Instead, they deviate significantly: they bend toward the equator over land and toward the poles over water.

Statement II is correct: Land has a lower specific heat than water, meaning it loses heat much faster. Consequently, in January, the large landmasses of North America and Eurasia are significantly colder than the Atlantic and Pacific Oceans at the same latitude.

The Relationship: Statement II explains Statement I: Because the land is colder than the ocean, a line of constant temperature (isotherm) leaving the warm ocean must "dip" south toward the warmer tropical latitudes to find the same temperature once it hits the cold land. When that same line leaves the cold land and enters the warm ocean, it must "climb" north toward the colder polar latitudes to maintain that same temperature value. Thus, the temperature difference is the direct cause of the bending pattern.