D
Parker sued Dodd over title to an island in a river. Daily variations in the water level were important. For many years Wells, a commercial fisherman, kept a daily log of the water level at his dock opposite the island in order to forecast fishing conditions. Parker employed Zee, an engineer, to prepare graphs from Wells's log. Wells was called to testify to the manner in which he kept the log, which had been available for inspection. His testimony should be:
A. Excluded on a general objection because not admissible for any purpose. 
B. Excluded on a specific objection that it calls for hearsay.
C. Admitted to support the credibility of Wells and Zee as witnesses.
D. Admitted as part of the foundation for admission of Zee's graphs.