Step 1: Solve Clue 1.
We need an 8 letter synonym of "recognize" that fits the pattern \(\_D\_NT\_FY\). The word IDENTIFY fits perfectly: I-D-E-N-T-I-F-Y, matching the given letters D, N, T, F, Y in their exact positions. Its first letter is I.
Step 2: Solve Clue 2.
We need a 5 letter word for "a story long enough to fill a book" fitting \(\_\_\_EL\). This is a NOVEL: N-O-V-E-L. Its first letter is N.
Step 3: Solve Clue 3.
We need a 6 letter word for "two of something" fitting \(\_\_\_PLE\). This is a COUPLE: C-O-U-P-L-E. Its first letter is C.
Step 4: Solve Clue 4.
We need a 4 letter word for "a fraction split equally into two parts" fitting \(\_\_\_F\). This is HALF: H-A-L-F. Its first letter is H.
Step 5: Collect the first letters.
The first letters of the four keywords are I, N, C, and H.
Step 6: Rearrange these letters into a four letter word.
The letters I, N, C, H can be rearranged to spell CHIN, which is a valid English word.
Step 7: Check the other options.
(B) COIN: Uses the letter O, which is not among I, N, C, H. Not possible.
(C) ITCH: Uses the letter T, which is not among I, N, C, H. Not possible.
(D) NOSE: Uses the letters O, S, and E, none of which are among I, N, C, H. Not possible.
Step 8: Final conclusion.
Only CHIN can be formed from the exact letters I, N, C, and H.
\[
\boxed{\text{CHIN}}
\]