Explanation
$$\textbf{Correct answer: C}$$
$$\textbf{Option (A):}$$
$$\bullet$$ Cyanobacteria is the blue-green algae that do not affect pregnant women and it does not cause abortion in those ladies.
$$\textbf{Option (B):}$$
$$\bullet$$ Not all forms of bacteria are responsible for causing an abortion in pregnant women.
$$\bullet$$ Some of the bacteria may affect the foetus while some of them only affect the mother and do not reach the foetus.
$$\textbf{Option (C):}$$
$$\bullet$$ If a pregnant mother suffers from a mycoplasma infection, it affects the placenta by blocking the passage of blood and food from the mother to the embryo.
$$\bullet$$ Due to their inability to get enough nutrients, the embryo fails to develop leading to abortion.
Hence, the correct answer is option (C).
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