In measuring the performance of a portfolio, the time-weighted rate of return is superior to the dollar-weighted

Question:

In measuring the performance of a the time-weighted rate of return is superior to the dollar-weighted rate of return because:
a. When the rate of return varies, the time-weighted return is higher.
b. The dollar-weighted return assumes all deposits are made on day 1.
c. The dollar-weighted return can only be estimated.
d. The time-weighted return is unaffected by the timing of contributions and withdrawals.

Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...