Concept:
Ashokan pillars are important Mauryan monuments. They are known for polished stone surfaces, inscriptions, and animal capitals such as lion, bull, horse, and elephant.
Step 1: Check statement A.
Elephant capital is associated with Sankisa.
So, statement A is correct.
Step 2: Check statement B.
Horse capital at Rummindei is mentioned in traditional accounts.
So, statement B is correct.
Step 3: Check statement C.
Ashokan inscription is associated with Kausambi pillar.
So, statement C is correct.
Step 4: Check statement D.
Bull capital is associated with Rampurva.
So, statement D is correct.
Step 5: Check statement E.
Chakra capital at Basarh-Bakhira, Vaishali is not accepted in this set.
So, statement E is incorrect.
Thus, the correct statements are:
\[
A,\ B,\ C,\ D
\]
Hence, the correct answer is:
\[
\boxed{\text{(C) A, B, C and D only}}
\]