Final answer:
The statement 'Leo tried to help his sister, yet she never seemed appreciative of his efforts.' is a compound sentence. If Jane attributes her bad grade to her professor disliking her, it demonstrates an external locus of control.
Step-by-step explanation:
The question "Leo tried to help his sister, yet she never seemed appreciative of his efforts." requires identifying the type of statement. We classify sentences based on their structure. This sentence is an example of a compound sentence because it contains two independent clauses joined by a coordinating conjunction ('yet'). Each clause could stand alone as a sentence: 'Leo tried to help his sister.' and 'She never seemed appreciative of his efforts.'
In response to the reference information provided, if Jane believes that she got a bad grade on her psychology paper because her professor doesn't like her, this reflects an external locus of control. Jane is attributing her bad grade to external factors—the attitude of her professor—rather than her own efforts or abilities.