Final answer:
Option A). Sarah most likely saw blocks that were both black and had crosses, since this combination is representative of a conjunctive concept in cognitive psychology, which requires objects to have a specific set of combined attributes to belong to a category.
Step-by-step explanation:
The notion of conjunctive notions, which entails learning to recognize objects that have a certain combination of properties, is probably what the student is referring to in cognitive psychology. The features Sarah most likely observed on the blocks were conjunctive in nature, meaning they required a combination of attributes to be regarded as part of the idea, which would explain why she found learning a conjunctive concept when shapes and textures were displayed on them rather simple.
A. black and crosses may be a conjunctive notion among the possibilities provided, meaning that both characteristics must exist for the block to be properly identified. Option B (circles or stripes), Option C (black or circles), and Option D (striped or cross) all allude to disjunctive ideas, in which the existence of one feature alone suffices to classify something.
Given that conjunctive concepts involve a clear rule that objects must meet both criteria to belong to the category, it is likely that Sarah saw blocks that had both black and cross characteristics in order to practice learning a concept that she found to be relatively easy.