I had been having a headache, so I will not attend the meeting.
I had been having a headache, so I will not attend the meeting.
Solution
This question tests tense consistency and cause-effect relationships.
When explaining why you'll do something in the future, use present tense for current conditions. Think of it like: "I'm sick now, so I won't go tomorrow." The headache happening now justifies the future decision.
Option 1 → Missing "a" makes this grammatically incorrect, like saying "have cold."
Option 2 → Past tense doesn't explain a future decision - that headache's over!
Option 3 → Present tense perfectly explains why you won't attend later. ✓
Option 4 → Past habit doesn't justify future actions - sounds randomly nostalgic.
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