We're assuming all horizontal lines are parallel. Let x be the distance between A and B
![(x)/(536)=(210)/(336)](https://img.qammunity.org/2021/formulas/mathematics/high-school/kv1yuficty9qjkhdmm13x1spy1ywxzk60v.png)
Cross multiply
![336x=536 * 210](https://img.qammunity.org/2021/formulas/mathematics/high-school/jd37vq1xbri1wbvjwfig96s7nj3fppm8hb.png)
Simplifying and solving for x gives us:
![x=335](https://img.qammunity.org/2021/formulas/mathematics/high-school/tp5d4jzvjjze1hyhimqomj8qnrxsogiqo3.png)
Now, add the distance between A and B and the distance between B and C to find the distance between A and C:
![335+536=871](https://img.qammunity.org/2021/formulas/mathematics/high-school/cyf10gntta48x5umnroackyfej44tviyt8.png)
The answer is choice C. Let me know if you need any clarifications, thanks!