Correct Option: A
The given statement is: Whenever I go in sun I feel headache. Here let us assume that X is "I go in sun" and Y is "I have headache"
Then situation is "Whenever X then Y" and implications in this is (X → Y) and (~ Y → → X), now lets check options one by one
Option (a) I went in sun so I have headache now. (X → Y) its right conclusion.
Option (b) I didn't go in sun so I don't have headache now.(~ X → Y) it can not be concluded
Option (c) I m feeling headache that means I went in sun. (Y → X), it can not be concluded.