The answer is (B)
Explanation:
The three types of symbiosis are:
1. Mutualism: It is a relationship in which both partners benefit each other.
For example: Humans take the oxygen given by the plants. In return, plants takes carbon dioxide, which is exhaled by the Humans.
2. Commensalism: It is a relationship in which only one partner is benefitted while the other is neither benefitted nor harmed.
For example: The tree frogs use plants as a mode of protection.
3. Parasitism: It is a relationship in which one partner (parasite) is benefitted while the other (host) is harmed.
For example: The organisms such as Helminthes stays inside the intestine of the host.
It causes infectious diseases, such as jaundice,diarrhoea, etc.
