Final answer:
The word meaning full of uncertainty and containing double Fs is 'iffy', making the correct answer option a.
Step-by-step explanation:
The word in question, meaning full of uncertainty and containing double Fs, is 'iffy.' The process of elimination helps identify the correct answer as option a. While option b, 'fuzzy,' implies a lack of clarity, it doesn't capture the essence of uncertainty. Options c and d, 'risky' and 'unsure,' respectively, lack the double Fs. 'Iffy' is an informal term widely used to convey a sense of doubt or uncertainty. By scrutinizing each option, it becomes evident that 'iffy' aligns perfectly with the specified criteria, making it the accurate choice for a word that combines the elements of uncertainty and double Fs.