Correct Words

Which of the following underlined word combinations are correctly used in the paragraph?

It is (i) highly unlikely that she’ll be sick again as she is (ii) completely recovered now. However, the doctor advises her to avoid doing (iii) vigorous exercises. Such exercises might cause (iv) grave injury to her body.
Choose one answer.
a. (ii), (iii) and (iv)
b. (i), (ii) and (iv)
c. (i), (ii) and (iii)
d. (i), (iii) and (iv)

I think ii is wrong so I would go with D. Am I correct?