Final answer:
The term 'wastrel' is synonymously matched with d) 'loafer,' both referring to someone who irresponsibly wastes time and resources. While 'idler,' 'malingerer,' and 'layabout' are related, 'loafer' is the closest fit to 'wastrel.'
Step-by-step explanation:
The word wastrel refers to someone who wastes their time and resources extravagantly and irresponsibly. Of the options provided, the one that best matches the word 'wastrel' is d) loafer.
All of the options given, i.e., a) idler b) malingerer c) layabout d) loafer, relate to someone who is not very productive or avoids work. However, 'loafer' is the closest synonym as it implies a lack of productivity combined with a sense of squandering time or resources aimlessly, similar to 'wastrel.'