The correct answer is: C. 3.0 Ã 10-5
The total shrinkage for a pre-tensioned beam is the change in length of the beam due to shrinkage of the concrete. Shrinkage is a natural process that occurs as concrete cures and dries. It is a volumetric change, meaning that all dimensions of the concrete will decrease. The amount of shrinkage will vary depending on the type of concrete, the mix proportions, and the curing conditions.
The value of 3.0 Ã 10-5 is the average value of total shrinkage for pre-tensioned beams. This value is based on data from a number of different studies. It is important to note that the actual value of shrinkage for a particular beam may vary from this average value.
The other options are incorrect because they do not represent the average value of total shrinkage for pre-tensioned beams.