Answer Happy

For the last hour I have been watching President Lincoln and General McClellan as they sat together in earnest conversation on the deck of a steamer closer to us. I am thankful, I am happy, that the President has come ג€" has sprung across the dreadful intervening Washington, and come to see and hear and judge for his own wise and noble self. While we were at dinner someone said, ג€Why, thereג€™s the President!ג€ and he proved to be just arriving on the Ariel, at the end of the wharf. I stationed myself at once to watch for the coming of McClellan. The President stood on deck with a glass, with which, after a time, he inspected our boat, waving his handkerchief to us. My eyes and soul were in the direction of the general headquarters, over which the great balloon was slowly descending.As used in the passage, the word glass means:

A. a goblet
B. a mirror
C. a window
D. a telescope E. bifocals