Which sentence has no errors in punctuation?
a. sorry, i didn't call you back but the dogs got out and i had to chase after them.
b. if we want to be on time, we'll have to leave now.
c. among the plants and bushes in the garden a little hummingbird flitted from flower to flower.
d. happy with my decision, to run for student council i celebrated by going shopping.

Armed with invisible ink, a cipher system, and a passion to end the war and preserve the union, elizabeth van lew became butler's eyes and ears in the confederate capital city. truth be told, however, she became much more than that. she became a spymaster, the person responsible for running a network of agents, couriers, and safe houses that was very active during the war. in addition to the spying, elizabeth van lew continued to maintain her church hill home as a safe house and something of a local union spy headquarters. —the dark game, paul janeczko what is the central idea of this passage? van lew’s home was used as a safe house, which was critical to the confederacy. van lew had a passion to end the war and preserve the union. van lew was a spymaster, a leading force in the espionage activities for the union. van lew did not enjoy working for general butler.