B. His or her. Because the other ones are not correct grammar. I might be wrong and if I am the answer is A. Their.
This is a scientific question, please post elsewhere.
Either bluest or most bluest it really matters which one matches with the paragraph or sentence .
Correction: In 2014, two female statues were uncovered in an ancient tomb in Greece whose entrance had been blocked by a wall of stones. Their discovery captured national attention for weeks.
D) The Tuolumne and Merced groves near Yosemite, the Dinky Creek grove, those of the General Grant National Park and the Sequoia National Park, with several outstanding groves that are nameless on the Kings, Kaweah, and Tule river basins, and included in the Sierra forest reservation, have of late years been partially protected by the Federal Government; while the well-known Mariposa Grove has long been guarded by the State.
