Final answer:
The correct situational attribution for why Justin hasn't called April would be that he is too busy, which links his lack of communication to external factors rather than his personal traits.
Step-by-step explanation:
In psychology, attributions are the explanations we give for people's behavior, and a situational attribution is when we believe a person's actions are due to external factors. In the scenario provided, if April is making a situational attribution for Justin's lack of communication, she is attributing his behavior to circumstances rather than his personality or disposition.
The answer to the provided question is (d) "He's so busy he hasn't had time to call." This option suggests that external demands or situations in Justin's life, such as work or other obligations, are the reason for not calling April, rather than aspects of his character or intentions. The other options provided represent dispositional attributions, which ascribe behavior to the individual's internal characteristics.