Vectors 2

$Consider\quad the\quad two\quad vectors\quad \overrightarrow { a } and\quad \overrightarrow { b } .\quad If\quad \left| \overrightarrow { a } \right| \succ \left| \overrightarrow { b } \right| ,\quad then\quad the\quad magnitude\quad of\quad their\quad sum\quad is\quad :$ A: $Cannot\quad be\quad greater\quad than\quad \left| \overrightarrow { a } \right| +\left| \overrightarrow { b } \right|$ B: $Cannot\quad be\quad less\quad than\quad \left| \overrightarrow { a } \right| +\left| \overrightarrow { b } \right|$ C: $Must\quad be\quad equal\quad to\left| \overrightarrow { a } \right| -\left| \overrightarrow { b } \right|$ D: $is\quad equal\quad to\left| \overrightarrow { a } \right| +\left| \overrightarrow { b } \right|$ Choose the correct answer.