Correct Answer: how can we

Solution : The first option is correct.

• Let's look at some conjunctions that contain the inverted form of the verb , apart from the interrogative sentences:
•  No sooner...than, hardly/scarcely…when, etc .
• Since the given sentence is assertive and doesn't contain any of the above-mentioned conjunctions , the use of the inverted form of the verb is wrong in the sentence .
• Hence, how we can will be used instead of how can we in the third part of the sentence.

Hence, the correct answer is: "We must plan how we can cope with the present situation."