This is a hard one to answer. The reason is that you are asked to distinguish between 2 schools of thought that are very close together. Not only that, but the characteristic you are looking for is not mentioned in either description.
Since semiotics brings in many more fields of study than does iconography, then I would go with iconography. This school of thought seems content just to find the symbols according to its description. What is done with them is mentioned in the other school but is not elaborated upon.
My answer would be iconography.
Answer:
I would caption this with a more dramatic tone
Explanation:
I would caption this with a dramatic tone due to the imagery of a wasteland that had experinced disaster
Answer: Continuous line
Explanation: The continuous line would be the correct answer seeing as how it is.. continuous. This line has no curve, gaps, or breaks.