Correct Option: C

murky (Adjective) : not clear; dark or dirty with mud or another substance; cloudy
gloomy (Adjective) : nearly dark or badly lit in a way that makes you feel sad; depressing;
glum;
misty (Adjective) : with a lot of mist; not clear or bright; blurred
obscure (Adjective) : not wellknown; unknown; difficult to understand
shadowy (Adjective) : dark and full of shadows; difficult to see because there in not much light