Final answer:
According to the principle of cross-cutting relations, the feature in the above cross section that is the youngest is the igneous intrusion.
The answer is option ⇒B. Igneous intrusion
Step-by-step explanation:
The principle of cross-cutting relations states that if one geologic feature cuts across another, the feature doing the cutting is younger. In the given options, an igneous intrusion is an intrusion of molten rock that cuts across the surrounding rock layers.
This means that the igneous intrusion must have occurred after the deposition and formation of the sedimentary rock layer and the folding of the strata. Additionally, the fault represents a fracture or break in the rock layers, which can occur at any time and is not necessarily indicative of age.
Therefore, option B, the igneous intrusion is correct answer