Correct Answer: Ritu is deficient in calcium.

Solution : The correct choice will be the second option.

The option in which all the words are spelt correctly is: Ritu is deficient in calcium.

Deficient: This word means lacking in a particular quality or quantity, especially in the context of nutrients like calcium. It is the correct spelling in this sentence.

The other options, deficient, deficient, and daficient , are all misspellings of the word deficient.