What is not an example of an area that is likely to undergo primary succession? a. a barnacle encrusted rock is exposed at low tide. b. a glacier begins to melt or move leaving exposed bare rock. c. a volcanic eruption leaves behind hardened lava flows. d. a landslide exposed bare rock

The correct option is A.
Succession is the process by which the structure of a particular community evolves over a specific period of time. There are two types of succession, primary and secondary succession. Primary succession is a type of succession that occurs in a place which is incapable of sustaining the growth of plants, that is, it usually occur on barren lands. All the options given above are examples of places for primary succession with the exception of option A.

They both have rock surfaces