Which of these represents an IPv6 link-local address?

link-local addresses always start at fe80::/10
each hex number takes 4 bits to represent
fe80 is
1111 – F
1110 – E
1000 – 8
0000 – 0

FE80 = 1111 1110 1000 0000
the mask is /10 so the first 10 bits are invariable
9th bit is always 1, 10th bit is always 0, that makes the maximum value for the first group of hex numbers in binary: 1111 1110 1011 1111, or FEBF in hex

the entire range would be… FE80:: to FEBF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
that’s a HUGE space. nothing new tho as this is ipv6 we’re talking about.
this means option B could be valid too. and it is

some reference:
http://en.wikipedia.org/wiki/Reserved_IP_addresses
http://en.wikipedia.org/wiki/Link-local_address

How abt answer B?
im confused i think B&C should b correct, am i correct?
pls xplain me

link local starts with FE80..ans i c)