In anterograde amnesia a. there is an inhibition of afferent inputs to the cerebral cortex b. ltm (long term memory) is not disrupted c. communication between the medial temporal lobe and the association cortex remains unaffected d. declarative memory is not significantly altered

The correct option is b. LTM (long term memory) is not disrupted.

Explanation:

Amnesia is a type of disorder that affects our memory, we talk about anterograde amnesia when it involves a serious damage/lost in our short-term memory (the long term memory is not disrupted), that is, it is the inability to create new memories. This selective memory deficit is caused by a brain lesion located in the hippocampus and in the areas of the medial temporal lobe. The hippocampus has the function of generating new memories, if it is affected, then it will be impossible to establish the memories.