Final answer:
If the Gulf Stream within the great ocean conveyor was disrupted, the western coast of Europe would likely become b. colder due to the diminished transfer of warm water from equatorial regions, which currently helps temper the climate.
Step-by-step explanation:
The great ocean conveyor, known as the thermohaline circulation, includes the Gulf Stream which significantly impacts the climate of Western Europe. If this current were disrupted, Western Europe would likely experience a colder climate. The Gulf Stream brings warm water from the Gulf of Mexico and the equatorial region northward, resulting in milder temperatures for Western Europe's west coast. The current's influence results in moderate year-round temperatures, higher than would be expected for such northern latitudes.
Without the moderating effect of the Gulf Stream, the heat transfer from the equatorial region to the North Atlantic would be less efficient, and the western coast of Europe would likely become colder. This is because the movement of warm water from the Gulf Stream is responsible for tempering the cold air masses coming from the Arctic, leading to milder winters and a more temperate climate overall.
Therefore, the disruption of the Gulf Stream would most likely result in a colder climate for the western coast of Europe, as the moderating effect of the ocean current on the regional climate would be diminished.