Step 1: First blank.
“The boss called to inform that he be coming…” → Correct usage is “won’t” (will not). “Wont” without apostrophe means “custom,” so the negative requires “won’t.”
Step 2: Second blank.
“…it was his to give them a surprise…” → Here the meaning is “habit” or “custom.” Therefore, the correct word is “wont.”
Step 3: Third blank.
“…would then be required to on the reasons…” → Here the meaning is “explain at length.” The correct word is “expatiate” (to write or speak in detail).
Step 4: Fourth blank.
“…had to work on Sunday to the wrong.” → The sense is “make amends for wrongdoing.” The correct word is “expiate.”
Step 5: Verify option.
The sequence is “won’t, wont, expatiate, expiate,” which matches option (A).
\[
\boxed{\text{Option (A)}}
\]