To identify the correctly spelled word, let us examine each option:
Option A: "achievemant"
This is a misspelling. The correct word is "achievement" — note the ending is "-ment", not "-mant".
Option B: "supperlative"
The correct spelling is "superlative" — with one "p". "Supperlative" is not a valid English word.
Option C: "transitive"
This word may seem correct, but in the given image, it is spelled as "transitve", which is incorrect. The correct form is "transitive". So this option is incorrect as per the spelling in the image.
Option D: "pharmaceutical"
This is the correct spelling. It refers to anything related to drugs or pharmacy.
Thus, Option D is the only word spelled correctly.