Which of the following statements suggest a resource is becoming less scarce?

a$)$ A reduction in the number of CPAs meant there were fewer applicants for accounting firms to choose from.

b$)$ Due to breakdowns in the supply chain for bicycle parts, firms couldn't sell as many bicycles.

c$)$ Electrical companies saw a decline in applications as fewer individuals earned certifications in electrical fields.

d$)$ New innovations in producing steel enabled auto firms to produce cars at a lower price.