English

The symptoms of diabetes often develop gradually and are hard to identify at first. Nearly half of all people with diabetes do not know they have it.

a. The symptoms of diabetes often develop gradually and are hard to identify at first, so nearly half of all people with diabetes do not know they have it.
b. The symptoms of diabetes often develop gradually and are hard to identify at first, yet nearly half of all people with diabetes do not know they have it.
c. Nearly half of all people with diabetes do not know they have it, and the symptoms of diabetes often develop gradually and are hard to identify at first.
d. The symptoms of diabetes often develop gradually for nearly half of all people with diabetes do not know they have it and are hard to identify at first.
Test ID: 418
Source: 501 Grammar and Writing Questions