The following is not true:

A.
Since the early days of mankind humans have struggled with the problems of protecting assets.

B.
The addition of a PIN keypad to the card reader was a solution to unreported card or lost card
problem.

C.
There has never been of problem of lost keys.

D.
Human guard is an inefficient and sometimes ineffective method of protecting resources.

Explanation:
This is absolutely false, this problem can be seen almost anywhere. There have
always been trouble with the lost of keys. Some of those looses are more important than others,
its not the same to lost the key of the company safe box, that lost the key of you locker with that
contains your shoes.
This is obviously an incorrect statement, answer C is the one in here.
“Unfortunately, using security guards is not a perfect solution. There are numerous disadvantages
to deploying, maintaining, and relying upon security guards. Not all environments and facilities
support security guards. This may be due actual human incompatibility with the layout, design,
location, and construction of the facility. Not all security guards are themselves reliable.
Prescreening, bonding, and training does not guarantee that you won’t end up with an ineffective
and unreliable security guard.” Pg 646 Tittel: CISSP Guide.