whether+infinitive

[maoyueh]

As we know, "whether+infinitive" is often used as object of a verb. For example, "He couldn't decide whether to go abroad or not/whether or not to go abroad." My question is, "whether+infinitive" can also be used as subject of a sentence?

Please take a look at the following sentences.
a. Whether to marry him or not is no laughing matter.
b. Deciding whether to marry him or not is no laughing matter.

Are both a and b correct? Or only b is correct? To my mind, both a and b are correct, but I am not sure. Please correct me if I am wrong. Thanks a lot.

[Barb_D]

I would consider A correct.
Whether it rains or not will determine our plans for tomorrow -- this seems okay to me too.