The best options to select when exporting are as follows:
You should get a bunch of text output like:
Wallet ID: blahblah
Wallet Name: Restored - blahblah
16Q9b1EYKtGHnNKYe595WYbPwBPGteFSwi
PrivBase58: 5KciH7KsejtT8bmx544FaXP2PVrVdxxeuS5LLnZvW2BCZ5sfKgf
1Fg7Tct4bUAjuqtZXxtWfbPrgKpP13mSnD
PrivBase58: 5JXDsBW2ugAYLfjP41uVNn6bcbxwnyF28WmXnrLh5BZ5kD23u4f
13DxavfD7dMBqsArxg3AHbK1vrLKwagtxb
PrivBase58: 5JXT7UTUU26mzV5J5rnQMgNPHRUZwtuDaRuQqFSrk589pHKsjMd
...
NOTE: You can NOT simply copy/paste everything from that screen into Electrum... it will not work. The ONLY part you want to copy/paste are the bolded strings of numbers/letters after the "PrivBase58:" labels...
ie:
5KciH7KsejtT8bmx544FaXP2PVrVdxxeuS5LLnZvW2BCZ5sfKgf
5JXDsBW2ugAYLfjP41uVNn6bcbxwnyF28WmXnrLh5BZ5kD23u4f
5JXT7UTUU26mzV5J5rnQMgNPHRUZwtuDaRuQqFSrk589pHKsjMd
You would then copy/paste just those strings into the "Import bitcoin addresses or private keys" dialog when importing into Electrum.