Answer:
The correct answer is option C. Tengamos.
Step-by-step explanation:
In this case, the verb conjugation of the verb TENER is made in the present of the subjunctive, which is used to make mandates.
In this case it is indicated to have cash and a credit card in case an emergency occurs. For that reason the best option in this case is Tengamos.
Let's have cash and a debit card for an emergency.
If we use TENEMOS, it would no longer be a mandate, but a fact.
We have cash and a debit card for an emergency.
Given this information, the correct answer is option C.