The number of species that are known and described range betwe | Bhawani Baba

The number of species that are known and described range between _. Fill in the blanks with the correct option from the following.

(a) 1.4 to 1.5 million (b) 1.6 to 1.7 million (c) 1.7 to 1.8 million (d) 1.9 to 2 million