What is the problem with the GRE over IPsec configuration displayed in the exhibit?

What is the problem with the GRE over IPsec configuration displayed in the exhibit?

A.
The network 172, 16.0,0 commands is missing under router eigrp 1,

B.
The crypto ACL is not correctly configured.

C.
ESP transport mode should be configured instead of using the default tunnel mode.

D.
The crypto map is not correctly configured.