The inability to recall what letters accompany the number 5 on your telephone is most likely due
a. source amnesia.
b. encoding failure.
c. retroactive interference.
d. the spacing effect.

b. encoding failure.

Explanation:

Encoding Failure is when our brain temporarily becomes unable to link our memory,failure to link number 5 with letters that accompanies it. Encoding is a term used to refer to how our brain stores and remembers the information that we have stored in a short or long term memory.

There can be failure in our encoding due to trauma or drug use.

well since twins have about the same dna they dont have one think in common which is the figer print. nobodys fingerprint is the same. if your using twin you would most likely get around the same results for both of them because of the genetics.. i hope this