Choose the letter A, B, C or D to complete the sentences with given words
About 95%/ the atmosphere/ on Mars/ be/ carbon dioxide, which/ be/ poisonous/ breath
A. About 95% of the atmosphere on Mars is carbon dioxide, which is poisonous to breath.
B. About 95% on the atmosphere on Mars is carbon dioxide, which is poisonous breath.
C. About 95% on the atmosphere on Mars is carbon dioxide, which is poisonous to breath.
D. About 95% of the atmosphere on Mars is carbon dioxide, which is poisonous breath.