Frankie has been active as a key presenter at a local insurance conference. As an expert, she would inform you that, from the following items, which circumstance would be deemed as a defensible and sustainable reason for an insurer to dispute a policy subsequent to the end of the contestable policy period?

A situation where a significant misrepresentation had been made by the insured during the application process.
	b.	The loss ratio of the insurer is operating at a higher rate than the insurer anticipated.
	c.	A different individual was used by the insured to take the medical examination required for policy approval.
	d.	Concealment of a material fact by the policyholder during the application process.