[单项选择]　　　 The lack of printing regulations and the unenforceabiliy of British copyright law 　　　 in the American colonies made it possible for colonial printers occasionally to act as 　　　 publishers. Although they rarely undertook major publishing project because it was 　　　 difficult to sell books as cheaply as they could be imported from Europe, printers in (5) Philadelphia did publish work that required only small amounts of capital, paper, and 　　　 type. Broadsides could be published with minimal financial risk. Consisting of only one 　　　 sheet of paper and requiring small amounts of type, broadsides involved lower investments 　　　 of capital than longer works. Furthermore, the broadside format lent itselt to subjects of 　　　 high, if temporary, interest, enabling them to meet with ready sale. If the broadside printer (10) miscalculated, however, and produced a sheet that did not sell, it was not likely to be a 　　　 major loss, and the printer would know this immediately,
A. Few colonial printers owned printing machinery the was large enough to handle major projects.
B. There was inadequate shipping available in the colonies.
C. Colonial printers could not sell their work for a competitive price.
D. Colonial printers did not have the skills necessary to undertake large publishing projects.