THE ANSWER:
“C”
Each of these letters appear virtually identical when printed in upper or lower case: Cc, Oo, Pp, Ss, Uu, Vv, Ww, Xx, Zz
Six other letters are close, but not quite as similar: Ff, Ii, Jj, Kk, Mm, Yy
The remainder of the letters are dissimilar:Â Aa, Bb, Dd, Ee, Gg, Hh, Ll, Nn, Qq, Rr, Tt
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