Final answer:
The triangles visible along one side of a front on a weather map point in the direction that the front is moving. Since the question mentions that the blue front with triangles is extending from the Louisiana low southward into the Gulf of Mexico, and the triangles show the direction of movement, the correct answer is that the front is moving to the North.
Step-by-step explanation:
The blue front extending from the Louisiana low and extending southward into the Gulf of Mexico shows triangles along one side indicating the direction the front is moving. These triangles symbolize the teeth of a saw and always point in the direction the front is moving. Given that the triangles are on one side of the front, this suggests that the front is indeed moving towards that direction.
If the triangles are on the southern side of the blue front, this would mean the front is moving towards the North. If they were on the northern side, it would imply a southerly movement. Since the blue front originates in the Louisiana low and extends southward, with the question suggesting that the triangles indicate the front is moving away from the Gulf of Mexico, the correct answer would be that the boundary is moving to the North (a).