Why is using ECDHE_ECDSA stronger than using RSA?

Why is using ECDHE_ECDSA stronger than using RSA?
A . ECDHE_ECDSA provides both data authenticity and confidentiality.
B . ECDHE_ECDSA uses a much larger key size.
C . ECDHE_ECDSA uses a pseudorandom function to generate the keying materials.
D . If the server’s private key is later compromised, all the prior TLS handshakes that are done using the cipher suite cannot be compromised.

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Answer: D