It will be unidiomatic to use "know as littering" or "known that litter".
Confused between B and C, I choseB as in C - Comma + which is modifying Bay should be incorrect.
(A) which triples to fifteen the number of wreck sites now known aslittering
(B) tripling to fifteen the number of wreck sites now known to litter
(C) which triples to fifteen the number of wreck sites now known to litter
(D) tripling to fifteen the number of wreck sites now[color=#ff0000] known
...
Confused between B and C, I choseB as in C - Comma + which is modifying Bay should be incorrect.
(A) which triples to fifteen the number of wreck sites now known aslittering
(B) tripling to fifteen the number of wreck sites now known to litter
(C) which triples to fifteen the number of wreck sites now known to litter
(D) tripling to fifteen the number of wreck sites now[color=#ff0000] known
...
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