Answer:
d. Enough information to give the reader a clear understanding of the original text.
Step-by-step explanation:
A summary is the shorter, revised version of the original text. This means that a summary will be shorter but will still contain the main points of the original text.
So, an effective summary will include enough information that will make the reader understand clearly what the original text talked about. The summary may be shorter but it must contain all the information that will enable the reader to have a clear understanding of the original text.
Thus, the correct answer is option d.