Probably A&B.
C is wrong. OTV do not extend spanning-tree.
See "Where Is My Spanning-Tree Root with OTV?" on page 5
https://www.cisco.com/c/dam/en/us/products/collateral/switches/nexus-7000-series-switches/guide_c07-728315.pdf
I think A E
https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OTV_Intro/DCI_1.html
OTV introduces the concept of “MAC routing,” […] it is justified by the need to limit flooding of Layer 2 traffic across the transport infrastructure.
The last capability introduced by OTV is to filter First Hop Redundancy Protocol (FHRP—HSRP, VRRP, and so on) messages across the logical overlay.
I definitely believe A and E as well. If you read the link in the reference whitepaper in the suggested answer above, you can literally find A. E. stated in there.
In the URL provided as reference says: "This is achieved by leveraging the same control plane protocol used for the exchange of MAC address information, without the need of extending the Spanning-Tree Protocol (STP) across the overlay".
So as CHEdot commented, C is incorrect.
I believe B and E are correct. I chose E because "The last capability introduced by OTV is to filter First Hop Redundancy Protocol (FHRP—HSRP, VRRP, and so on) messages across the logical overlay."
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