Answer :
Final answer:
The dial bore gauge is the recommended tool for checking a cylinder block line bore among the provided options, due to its ability to provide precise and direct measurements of the bore (option b).
Explanation:
Among the provided options, the suggested tool for checking a cylinder block line bore would be the dial bore gauge. The dial bore gauge provides a precise and direct measurement of bores and cylinders. This tool is inserted into the bore and then expanded until it touches the sides of the bore. An analog or digital dial on the gauge provides the specific measurement.
Using a straightedge and thickness gauges or a dial indicator will not provide the direct and precise measurement needed. The master line bore bar is usually used for aligning bores or used as a reference, not for measuring.
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