Select the most appropriate option that can substitute the underlined segment in the given sentence.
No sooner had she finished her breakfast that she had received a phone call from her boss, informing her that she needed to come to work immediately.

To determine the correct substitute for the underlined segment, let us analyze the grammatical structure of the sentence:

1. The correlative conjunction rule:
The sentence begins with the adverbial phrase "No sooner". In English grammar, the phrase "no sooner" is part of a correlative pair and must always be followed by "than" to introduce the second action that happened immediately after the first.
Therefore, using "that" (as in "that she had received") is grammatically incorrect. It must be replaced with "than".

2. Tense consistency and sentence structure:
The sentence structure is:
No sooner + auxiliary verb (had) + subject (she) + past participle (finished) + ... + than + subject + past simple verb.
The first action ("had she finished her breakfast") is in the past perfect tense. The subsequent action that happened immediately after must be in the simple past tense to show the sequence of events.
Hence, the verb should be "received" (simple past) rather than "had received" (past perfect) or "receives" (simple present).

Combining these two rules, "that she had received" must be substituted with "than she received".

Therefore, the correct option is "than she received".