Diaphragms are contraceptive devices used by the females. Choose the correct option from the statements given below:

i. They are introduced into the uterus

ii. They are placed to cover the cervical region

iii. They act as physical barriers for sperm entry

iv. They act as spermicidal agents

Diaphragms are barriers inserted into the female reproductive tract and not uterus to cover the cervix during coitus. So statement (i) is incorrect.

They prevent conception by blocking the entry of sperms through the cervix. They are reusable.

Spermicidal agents like creams, jellies and foams are usually used with these barriers to increase their contraceptive efficiency.

So, correct answer is option (c).