Which choice completes the text so that it conforms to the convention…

Source Texts

Text

Most sand is beige because of deposits of gray- and tan-hued minerals, such as quartz and feldspar. The sand at Balos Beach in Greece is a more unusual ______ deposits of crushed coral and other organic matter lend the sand a unique pink hue.

Which choice completes the text so that it conforms to the conventions of Standard English?

shade, though

shade; though

shade, though,

shade, though;