The correct answer is A. can speak.
The verb “speak” is a regular verb, which means that it follows the regular conjugation rules for English verbs. The present tense conjugation of “speak” is “I speak, you speak, he/she/it speaks, we speak, you speak, they speak.”
The other options are incorrect because they do not follow the regular conjugation rules for English verbs. Option B, “can be speak,” is incorrect because the verb “be” is not conjugated correctly. Option C, “can speaking,” is incorrect because the verb “speak” is not in the correct tense. Option D, “am speak,” is incorrect because the verb “speak” is not in the correct person.
In conclusion, the correct answer to the question “I . . . . . . English now” is A. can speak.