Answer:
Promissory estoppel
Explanation:
Based on Promissory estoppel
Promissory estoppel is the legal principal that a promise is enforceable by law even if made without a formal consideration when a promisor has made a promise who than relies on that promise to his subsequent detriment. So, in the question the case mentioned is of the Promissory estoppel as The electrical subcontractor may no longer withdraw the bid to the general contractor