What are the three reasons often put forward to explain the relatively high failure rate of internal new ventures?

a$.$ Small$-$scale entry, good commercialization, and good implementation

b$.$ Small$-$scale entry, poor commercialization, and good implementation

c$.$ Large$-$scale entry, good commercialization, and good implementation

d$.$ Large$-$scale entry, poor commercialization, and poor implementation

e$.$ Small$-$scale entry, poor commercialization, and poor implementation