When a Share Goes Ex-Rights,assuming Everything Else Remains the Same,its

When a share goes ex-rights,assuming everything else remains the same,its price should:

A) increase, as the company no longer has the right to make the shareholder convert.
B) decrease, as the shareholder is losing an option.
C) remain the same, as the market knows about it in advance.
D) increase, as a successful rights issue will raise a large amount of cash.