已知 𝑎 → , 𝑏 →  均为非零向量，且满足 ( 𝑎 → + 𝑏 → ) ⊥ 𝑎 → , ( 2 𝑎 → + 𝑏 → ) ⊥ 𝑏 → , 则 𝑎 → 与   𝑏 → 的夹角是（    ） Let  𝑎 → , 𝑏 →   be two nonzero vectors satisfying ( 𝑎 → + 𝑏 → ) ⊥ 𝑎 → , ( 2 𝑎 → + 𝑏 → ) ⊥ 𝑏 → . The angle between  𝑎 → and  𝑏 →   is  (    )单项选择题

A

𝜋 4

B

𝜋 3

C

3 𝜋 4

D

2 𝜋 3

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