There Is Some Debate About Whether Homo Floresiensis Is a Separate

There is some debate about whether Homo floresiensis is a separate species or an aberrant form of Homo sapiens. Regardless, what we do know is that H. floresiensis were only found on an Indonesian island and adults were only 3 feet tall. What factors would have selected for this distinct phenotype on an island habitat, specifically?

A) Height is only advantageous if there are predators present on the island.
B) Plants on that island never grew tall, so it was advantageous to be short.
C) The smaller body size was advantageous for living on an island, as food is often limited on islands.
D) The smaller body size made swimming easier.
E) The smaller body size made conserving heat easier.