Cash flows to stock and bond mutual funds have gained strength in the last two months, but fund managers have not been eager to invest the new money, instead of preferring to raise the cash levels in their portfolios at the highest level in six months.
(A) have not been eager to invest the new money, instead of preferring to raise the cash levels in their portfolios at
Portfolios at – Not the right idiom and meaning will be distorted, if we use ‘at’
(B) have not been eager to invest the new money, instead preferring to raise the cash levels in their portfolios to
At one instance , I doubted it . But if we observe carefully , instead is an adverb . We can use adverb at the beginning of the clause or at the end of the clause. So, there is no problem in using it here. Preferring – fund managers(Subject of this clause ) prefer to raise the cash levels
(C) have not been eager at investing the new money, instead of preferring to raise the cash levels in their portfolios to
Eager at – might be an issue. They prefer to raise the cash levels , not that they are not eager to invest instead of preferring to raise the cash . Meaning is distorted.
(D) were not eager to invest the new money, instead of preferring to raise the cash levels the cash levels in their portfolios at
Portfolios at – Idiom error. Were – Simple past – I doubt if we can use simple past here. Instead of – another issue.
(E) were not eager at investing the new money, instead preferring to raise the cash levels in their portfolios to
Error – Were – Not so clear why we should use simple past tense here.
So, B is the best choice overall.