Suppose that firms become more optimistic about future economic conditions and increase investment spending from $215 billion to $245 billion. Assuming no change in the aggregate price level and MPC = 0.5, this will cause a _______.

a.$460 billion increase in RGDP, comprised of $230 billion in investment spending plus another $230 billion in induced consumption spending

b.$115 billion increase in RGDP, composed of $30 billion in additional investment spending plus $85 billion in induced consumption spending

c.$60 billion increase in RGDP, comprised of $30 billion in additional investment spending plus $30 billion in induced consumption spending

d.$125 billion increase in RGDP, composed of $100 billion in investment spending plus $25 billion in induced consumption spending